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A block of mass m is connected to anothe...

A block of mass m is connected to another block of mass M by a spring (massless) of spring constant k. The block 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 of the block of mass M.

A

`(MF)/((m+M))`

B

`(mF)/(M)`

C

`((M+m)F)/(m)`

D

`(mF)/((m+M))`

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