Question

A rigid ball of mass m strikes a rigid wall at `60^(@)` and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wll on the ball will be

A. mv
B. 2mv
C. mv/2
D. mv/3

Answer 1

Correct Answer - A
(a) Impulse is imparted due to change in perpendicular components of momentum of ball.
`J=Deltap=mv_(s)-mv_(i)`
`mv cos 60^(@)-(-mv cos60^(@))`
`=2mv cos 60^(@)=2 mvxx(1)/(2)`