Question

A 0.5 kg ball is dropped from such a height that it takes 4s to reach the
ground. Calculate the change in momentum of the ball.
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Answer 1

final velocity of ball after 4s be v

v=u+at

v=10*4

v=40m/s

change in momentum will be 0.5(40-0)

20kgm/s

Answer 2

solution is attached above......