A person of mass \( m \) is standing on one end of a plank of mass \( M \) and length \( L \) an....

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A person of mass \( m \) is standing on one end of a plank
\( \mathrm{P} \)
of mass \( M \) and length \( L \) and floating in water. The person moves from one end to another and stops.
W
Work done by normal force is -
(1) \( M g L \)
(2) \( m g L \)
(3) \( \frac{m M g L}{M+m} \)
(4) 0


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