Two identical blocks, each having mass M, are placed as shown in figure. These two blocks A and B are smoothly conjugated, so that when another block C of mass m passes from A to B there is no jerk. All the surfaces are frictionless, and all three blocks are free to move. Block C is released from rest, then

Options

A. when in is at the highest position on `B`
B. when in is at the lowest position and moving left.
C. when in is at `C`
D. when in is at lowest position and moving right.

Answer

B

Explanation

Till then m remains on `B, B` will continue to acelerate due to contact force between `m` and `B`. Hence, velocity of `B` will be maximum when finally `m` leaves `B`.