In the figure, the block `B` of mass `m` starts from rest at the top of a wedge `W` of mass `M`. All surfaces are without friction. `W` can slide on the ground. `B` slides down onto the ground, moves along it with a speed v, has an elastic collision with the wall, and climbs back on to `W`.

Options

A. B will reach the top of W again
B. Form the beginning,till the collision with the wall , the center of mass of 'B plus W' does not move horizontally
C. Aftr the collision, the center of mass of B' plus W' moves with the velocity `(2mV)/(m+M)`
D. When B reaches its highest position on W, the speed of W is `(2mV)/(m+M)`

Answer

A