A man of mass \( M \) stands at one end of a plank of length \( L \...

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A man of mass \( M \) stands at one end of a plank of length \( L \) which lies at rest on a frictional surface. The man walks to the other end of the plank. If
\( \mathrm{P} \) mass of the plank is \( 3 \mathrm{M} \), the distance that man moves relative to the ground is :-
W
(1) \( \frac{L}{4} \)
(2) \( \frac{3 L}{4} \)
(3) \( \frac{2 L}{3} \)
(4) \( \frac{L}{3} \)
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