- A ball strikes the floor vertically downward with a speed 5 m/s and rebounds with the same speed.The magnitude of its change in velocity will be?
Magnitude of change is always equal to the difference of initial and final.
So, initial velocity = - 5m/s
Final velocity = 5 m/s
So, final - initial = 5-(-5)=10 m/s
It is true to believe that how the change could be 10 when in real the ball is still moving with the same speed.
For this, we can see the minute aspect of the impact which is the ball was at 5m/s and then after touching the ground, it got reduced to zero. The energy that the ball transferred to the ground came back to it and then it came up at the speed of 5m/s.
So, initial velocity = - 5m/s
Final velocity = 5 m/s
So, final - initial = 5-(-5)=10 m/s
It is true to believe that how the change could be 10 when in real the ball is still moving with the same speed.
For this, we can see the minute aspect of the impact which is the ball was at 5m/s and then after touching the ground, it got reduced to zero. The energy that the ball transferred to the ground came back to it and then it came up at the speed of 5m/s.