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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' :

A

`frac(mF)(M)`

B

`frac((M+m)F)(m)`

C

`frac(mF)((M+m))`

D

`frac(MF)((M+m))`

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