A man of mass m moves with a constant speed on a plank of mass M and length I kept initially at rest on a frictionless horizontal surface from one end to the other in time t. The speed of the plank relative to ground while man is moving, is

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ltMm

ltmm + M

ltMM +m

None of these

answer is B.

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Detailed Solution

We know that, vr=ltNow, m(vr - v)=Mv (v=speed of plank)∴ v=mvrM+m=ltmM+m

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