Question

A ball of mass 0.3kg moving at a velocity of 20.ms-1 is suddenly hit by a force of 5N for a tie of 0.3sec. Find its new velocity of motion

Answer 1

impulse = change of momentum = force * time

5 N * .3 s = 1.5 kg m/s
original momentum = 6 kg m/s
final momentum = 6 + 1.5 = 7.5 kg m/s
final v = 7.5 / .3 = 25 m/s