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A boy of mass m stands on one end of a w...

A boy of mass m stands on one end of a wooden plank of length L and mass M. The plank is floating on water. If the boy walks from one end of the plank to the other end at a constant speed, the resulting displacement of the plank is given by :

A

`(mL)/(M)`

B

`(ML)/(m)`

C

`(mL)/((M-m))`

D

`(mL)/((M+m))`

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