explain why a cricketer moves his hands backwards while catching a fast moving cricket ball.

A cricketer moves his hand backwards because by doing this he increses the time due to which the rate of change of momentum decreases. That means that the ball comes to rest gently and does not hurt the fielder. But, if does not move his hand backwards, then the ball would come to rest in a fraction of a second with a high rate of change of momentum. The ball will exert a lot of force on the hands of the fielder which will hurt him

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a cricketer moves his hand backwards because by doing this he increases the time due to which rate of change of momentum decreases and no pain will be there
 
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This happens because balls come with a greater force which could hurt the fielder. Force is equal to m ×a . We can't reduce mass therefore we reduce acceleration of ball is reduced by increasing the time it would come to rest. This decrease force of ball and fielder don't get injured because of ball.
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A cricketer moves his or her hannds backward so as to increase the time period and as the time increases the force decreases (the applied force)as force is inversly proportional to time.(force = change in momentum / time).
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This is done to prevent injury to the hands. Because the ball is having a large momentum. To stop this cricket ball, it's momentum is to be reduced to zero. Now when a cricket player moves back his hand on catching ball, then the time taken to reduce the momentum of the ball to zero is increased. Due to more time taken to stop the ball, the rate of change of momentum of ball is decreased and hence less force is exerted on the hands of the player. So,he does not get hurt. Hope this answer help you, Thank you
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a cricketer moves his hands backwards before catching a ball because if he does so the time take by the body to come to rest will increase causing lesser pain as compared to the first case
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watch on youtube u wil get it
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a cricketer moves his hands backwards after catching the ball because this action helps the fast moving ball momentum more gently ,exerts less pressure on the hands and hence prevents injury to the hands.
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he will get less pain if he moves his hand backward while catching the basll
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To reduce the speed by increasing the time which in turn reduces the force
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While catching a fast moving cricket ball , a fielder in the ground gradually pulls his hand backwards with the moving ball, In doing so, the fielder increases the time during which the high velocity of the moving ball descrease to zero. thus, the accleration of the ball is descreased and therefore the impact of catching the fast moving ball is also reduced. 
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yutyu
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dfdfa
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A cricketer moves hands backward.because there is inertia of motion so, the want's to be in motion.

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by doing so the velocity of  the ball will decrease and he won't get hurt
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to increase time and reduce the speed of ball 
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plzzz give it a thumzz up

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Because of Newton's second law of motion, which says that the force exerted by a body is directly proportional to the rate of change of momentum of the body.

  Here the body is the ball. Before hitting the cricketer hand the ball was travelling with speed v and after hitting his hand, if the speed reduces to zero in very less time, then rate of change of momentum will be very high. Thus , the force exerted on the hand will also be very high. Therefore, the cricketer lowers his hand, thus reducing the speed of the ball slowly to zero instead of immediately reducing it to zero. This decreases the rate of change of momentum and hence the force exerted on his hand is also decreased, thus it saves his hand from getting hurt.

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He does so as it will increase the time of the ball coming to rest which in turn reduce the force on the player's hand.
It is based on the II law of motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force. 
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answer

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Momentum
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Please find this answer

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Because as the ball is in motion but hand is in rest,so the ball may injure the cricketer.But to adjust with the motion of ball the cricketer moves his hand backward while catching it.
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because to reduce force because when he move his hand backwards and it will get more time to Momentum be zero and as we know that forces are inversely proportional to time so when he moves his hand backwards and then time increase and hence force decreases if he do not do like this then his hand will get injured
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Cricketer moves his hand backwards while catching because to increase time of momentum and speed to catch with out pain
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Because the time to stop the ball is increased and hence less force has to applied to cause the same change in the momentum of the ball therefore the hands of the player are not injured
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A crickter moves his hand backwards as when he moves his hand backward time period of ball to come at rest increases and the momentum comes to zero slowly hence doesn't hurt but whenever he doesn't moves his hand backward then crickkter may hurt because momentum comes to rest suddenly......
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Because it reduces momentum of the ball and we do not get much hurt
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to decrease the velocity
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As by withdrawing his hand he increases the time and hence, force get decreased. It is because time is indirectly proportional to force.
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The fielder increases the time for catching the ball by lower his hands backward . As times increases, the rate of change of momentum decreases, and the force acting on the hands is reduced to avoid injury.
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Let u be the velocity of the ball of mass m when it reaches the hands of the player catching it.
The initial momentum of the ball =m u
When the cricketer stops the ball (v=0),its final momentum=m* 0=0.
Change in momentum
=final momentum- initial momentum
=0- mu= -my=my (numerically)
Here -ve sign shows that the change in velocity in momentum is in direction opposite to the initial direction of momentum.
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Because the fast moving cricket ball has a very high momentum but by moving his hands backwards the time increases due to which the momentum becomes low
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To reduce the momentum of that ball
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a cricketer moves his hand backward while catching a fast moving cricket ball because the velocity of the ball is higher to reduce the velocity of the ball the cricketer moves his hand backwards
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Very simple concept
When a ball comes towards the fielder he is facing a high momentum of the ball thus to decrease this momentum the crickter pulls his hand backwards

(Here in the above case the momentum of the ball is high bcz of its mass)

Thanks
Nishant
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Because of impulsive force
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By pulling the hand gradually backward with the moving ball, the fielder increase time during which the momentum of the ball coming with high velocity decrease slowly and therefore the impact of catching the fast-moving ball is reduced
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A cricketer moves his hand backwards because by doing this he increses the time due to which the rate of change of momentum decreases. That means that the ball comes to rest gently and does not hurt the fielder. But, if does not move his hand backwards, then the ball would come to rest in a fraction of a second with a high rate of change of momentum. The ball will exert a lot of force on the hands of the fielder which will hurt him
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The cricketer moves his hands backwards while catching a fast moving cricket ball bcz he reduce the velocity of the ball so he moves his hands backward
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When the ball is coming at a very high speed it can cause serious injury in the hand of the catching person due to the high momentum so the cricketer move his hand backwards while catching the ball to reduce the momentum
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Ball excrets more inertia, player swing his hands to balance, otherwise player will be injured
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to decrease the fast momentum of ball small force is exerted on balll
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For decreasing the momentum of the ball
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A cricketer moves his hands backwards while catching a fast ball to avoid injury to his hand . By doing so the time taken by ball's momentum to reach 0 increases and as a result the speed of the ball slows down and he can catch it easily
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To reduce the effect of force...as we know that jerk =ft or delp =ft
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Why are some of these called saturated and others are called unsaturated compounds
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For decreasing the momentum of ball.as if large force applied by cricketer helps him to decrease the velocity of ball.hence the momentum of ball also decreases and the ball stops
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Please find this answer

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Please find this answer

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A cricketer moves his hand backwards because by doing this he increses the time due to which the rate of change of momentum decreases. That means that the ball comes to rest gently and does not hurt the fielder. But, if does not move his hand backwards, then the ball would come to rest in a fraction of a second with a high rate of change of momentum. The ball will exert a lot of force on the hands of the fielder which will hurt him
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To increase the time.
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Sorry i dont know
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In doing so, the fielder increases the time during which the high velocity of the ball decreases to zero. Due to more time taken to stop the ball, the rate of change of momentum of ball( or acceleration) decreases and hence a small force is exerted on the hands of the fielder which makes him not get hurt
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due to impact
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A fast moving cricket ball has a large momentum.when the cricket player moves his hand backward, the time taken for the ball to reach 0 or at rest increases. Hence the rate of change of momentum decreases and a small force will be exerted on the players hand.hence the played does not get hurt.
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