Question

a person of mass M is standing on one end of a plank of mass M and length L and floating in water the person moves from one end to another and stops. work done by normal force is-

Answer 1

· A MAN OF MASS M STANDS AT ONE END OF A PLANK ...
The man is on the other side of center of mass now, and ...
Distance moved by the man
=> L/8 + L/8
=> L/4.......

Answer 2

Answer:

Explanation:

Let displacement of plank is x Let velocity of person wrt. plank is v and velocity of plank is opposite direction is V.

According to law of conservation of momentum mv = (m + M)V

or mL/t = (M + m) x (x/t)

where t is time of motion x = mL/(m+M)