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Question

A block of mass M is pulled along a horizontal rough surface by a rope of mass m by applying a force F at one end of the rope. f is the friction between block and the surface. The force which the rope exerts on the block is:

A
FMm+M+f
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B
mFm+Mf
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C
mf+FMM+m
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D
MFfmMm
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Solution

The correct option is B mf+FMM+m
Friction force is only applied on M, it is f.
(M+m)a=Ffa=FfM+m
So, the force due to rope is: Ma+f=mf+FMM+m

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