Solve this:
(1) a. Define kinetic energy
b. Give two example from your daily life where you can see kinetic energy is doing work.
c. The kinetic energy of an object of mass m, moving with a velocity of 5ms-1 is 25 J. What will be its kinetic energy if its velocity is double ?
(2) Write any one difference between annelids and arthropoda giving one example of each.
 

Dear Student ,
Kinetic Energy 

Kinetic energy is the energy associated with the movement of objects. Although there are many forms of kinetic energy, this type of energy is often associated with the movement of larger objects. For example, thermal energy exists because of the movement of atoms or molecules, thus thermal energy is a variation of kinetic energy. However, most of the time, kinetic energy refers to the energy associated with the movement of larger objects. Therefore, if an object is not moving, it is said to have zero kinetic energy. The kinetic energy of an object depends on both its mass and velocity, with its velocity playing a much greater role 

Example: 
1)An asteroid falling to earth at incredible speeds has an enormous amount of kinetic energy. 
2)A river flowing at a certain speed possesses kinetic energy because the water has a certain mass and it also has velocity.
(C) 12mv2= 25 J  Let mass= m v= 5m/s 12mv2= 12×m×(5)2=25 m225 =25 m2m=2   if velocity is doubled=  v= (5×2)= 10m/s m=2 K.E= 12mv2=12×2×100= 100 J
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Solve ques no 20
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Kinetic Energy

Kinetic energy is the energy associated with the movement of objects. Although there are many forms of kinetic energy, this type of energy is often associated with the movement of larger objects. For example, thermal energy exists because of the movement of atoms or molecules, thus thermal energy is a variation of kinetic energy. However, most of the time, kinetic energy refers to the energy associated with the movement of larger objects. Therefore, if an object is not moving, it is said to have zero kinetic energy. The kinetic energy of an object depends on both its mass and velocity, with its velocity playing a much greater role

Ex
1)An asteroid falling to earth at incredible speeds has an enormous amount of kinetic energy.
2)A river flowing at a certain speed possesses kinetic energy because the water has a certain mass and it also has velocity.
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(a) Kinetic Energy is the energy possessed by the object by the virtue of its motion. K.E of a body moving with a certain velocity is a        work done on it to acquire that velocity.
 
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(C) 1/2 mv​​​2= 25 J 
Let mass= m
v= 5m/s
1/2 mv2= 1/2 * m* (5)2=25
m/2 * 25 = 25
m/2-= 25/25
m/2=1
m=1*2
m=2


if velocity is doubled= 
v= 5(2)= 10m/s
m=2
K.E= 1/2 mv2= 1/2 * 2*  (10)2
= 1* 100= 100 J
 
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