Question

A ball of mass m moving with velocity `v_0` collides a wall as shown in figure. After impact it rebounds with a velocity `3/4v_0`. The impulse acting on ball during impact is

A. (a) `-m/2v_0hatj`
B. (b) `-3/4mv_0hati`
C. (c) `(-5)/(4)mv_0hati`
D. (d) None of the above

Answer 1

Correct Answer - C
`Impu lse=Deltap=m(v_f-v_i)`
`=m[(-3/4v_0cos50^@hati+3/4v_0sin53^@hatj)-(v_0cos37^@hati+v_0sin37^@hatj)]`
`=-5/4mv_0hati`