Question

A ball of 0.5 kg mass moving with a speed of 10 m/s rebounds after striking normally
a perfectly elastic wall. Find the change in momentum of the ball.
(b) 0
(c) 20
(d) 50
a 10​

Answer 1

mass = 0.5 kg

velocity = 10 m/s

momentum at first = p

p = mv

p = 0.5 × 10 = 5 kg m/s ( initial momentum )

final momentum = p

mass = 0.5 kg

velocity = 0 m/s

p = mv

p = 0.5 × 0 = 0 kg m/s

therefore, the answer is option 'a' which is 0