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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 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.

A

`(mF)/M`

B

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

C

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

D

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

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