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Question

A block of mass m is connected to another block of mass M by a massless spring 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 accelerate it. Find the force on the block of mass m.

A
MF(m+M)
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B
MFm
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C
(M+m)Fm
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D
mFm+M
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Solution

The correct option is D mFm+M
Using Newton's second law, acceleration of the whole system, a=FnetMtotal=Fm+M
Net force on block of mass m=ma=mFm+M

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