Question

A body is made in the form of wedge with an angle 45°. See figure. A ball of mass m, moving horizontally at a speed v = √2 m/s , collides with the wedge of mass M = 2m. As a result of the impact, the ball bounces vertically upward. Neglect the friction between the wedge and horizontal surface. The
speed of the ball just after the impact is
(1) 0.5 m/s
(2) 2 m/s
(3) √2 m/s
(4) 1 m/s​

Answer 1

According to conservation of momentum,

M1V1+ M2V2= MV

M√2+2m√2 sin45= mv

V=2+ √2m/sec

Answer 2

Answer:

Explanation:M1V1+M2V2=MV

M root 2+2 root2 sin 45=mv

v.=2+root 2 m/sec