A man stands at one end of the open truck which can run on frictionless horizontal rails. Initially, the man and the truck are at rest. Man now walks to the other end and stops. Then which of the following is true?

Options

A. The truck moves opposite to direction of motion of man even after the man ceases to walk.
B. The center of mass of the man and truck remains at the same point throughout the man's walk.
C. The kinetic energy of man and truck are exactly equal throughout the man's walk.
D. The truck does not move at all during the man's walk.

Answer

B