question_answer

A man of mass m is standing on one end of a plank of mass 1m floating on a river. The other end just touches the bank of the river as shown in figure. With what minimum speed (in m/s) w.r.t. the plank should the man jump to get out of the river. All surfaces are smooth and plank is always in level with the bank. Given that the length of the plank is 15 m.

Answer:

9