Question

A man of mass ‘m’ standing on a plank of mass ‘M’ which is placed on a smooth horizontal surface, is initially at rest. The man suddenly starts running on the plank with a speed of ‘v’ m/s with respect to the ground. Find the momentum of the plank with respect to the ground

Answer 1

The plank does not move respect to the ground but the man runs on the plank .So the velocity of thr plank respect with the is nil (zero)(0m/s).