Question

A ball of mass 1 kg moving with a speed of 10 ms^-1 rebounds after a perfect elastic collision with the floor. Calculate the change in linear momentum of the ball.

Answer 1

Mass of a ball = 1 kg
Velocity of the bail before collision,
u = 10 m/s
Velocity of the ball after collision,
v = – u
= -10 m/s
Change in momentum,
P = m(v – u)
P = 1(-10 – 10)
= -20 kg m/s.