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A block of mass m is connected to another block of mass M by a spring (massless) of spring constant k. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force F starts acting on the block of mass m to pull it. Find the force on the block of mass m.

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$\frac{m F}{M}$

$\frac{(M + m) F}{m}$

$\frac{m F}{(m + M)}$

$\frac{M F}{(m + M)}$

answer is D.

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Detailed Solution

f = Ma

= $\frac{M F}{m + M}$ $(∵ a = \frac{F}{m + M})$

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