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Q.

In the figure shown, a small block of mass m is kept on M, placed on a horizontal surface. All surfaces are smooth and a force F is applied on M.

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a

The acceleration of m w.r.t. ground is Fm

b

The acceleration of m w.r.t. ground is zero

c

The time taken by m to separate from M is 2lmF

d

The time taken by m to separate from M is 2IMF

answer is B.

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Detailed Solution

Since friction is absent everywhere, soa=FMSince s=12at2⇒ l=12FMt2⇒ t=2lMF
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