A ball of mass `m` collides horizontally with a stationary wedge on a rough horizontal surface, in the two orientations as shown. Neglect friction between ball and wedge. Two student comment on system of ball and wedge in these situation

Saurav: Momentum of system in x-direction will change by significant amount in both cases.
Rahul : There are no impulsive external forces in y-direction in both cases hence the total momentum of system in y-direction can be treated as conserved in both cases.

Options

A. Saruav is wrong and Rahul is correct
B. Saurav is correct and Rahul is wrong
C. Both are correct
D. Both are wrong

Answer

D

Explanation

In the second coase normal force by ground will be impulsive hence frictional force is also impulsive. So we can neglect it