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 highest when it just touches the spring
B. `v` is highest when it compresses the spring by some amount
C. `v` is highest when the spring comes back to natural position
D. `v` is highest at the maximum compression

Answer

B

Explanation

speed (and hence the kinetic energy) will increase as long as `mg sin theta gt kx`.