A mass m is at rest on an inclined plane structure of mass M which is further resting on a smooth horizontal plane. Now if the mass starts moving, the position of the centre of mass of the system will

Options

A. remain the same
B. change along the horizontal
C. change along the vertical
D. change along the vertical while remains same along the horizontal

Answer

D

Explanation

The mass moves under the influence of gravitational pull which acts along the vertical. Thus the centre of mass changes along the vertical while it remains same along the horizonatal direction.