A body of mass m is released from a height h on a smooth inclined plane that is shown in the figure. The following can be true about the velocity of the block knowing that the wedge is fixed. .

Options

A. v is maximum when it just touches the spring
B. v is maximum when it compresses the spring by some amount
C. v is maximum when the spring comes back to natural position
D. none of these

Answer

B

Explanation

Velocity is maximum when acceleration is zero. It means net force is zero. Net force is zero after some compression.