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Physics Question on laws of motion

A block of mass mm is connected to another block of mass MM by a spring (massless) of spring constant kk. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force FF starts acting on the block of mass MM to pull it. Find the force on the block of mass mm

A

mFM\frac{mF}{M}

B

(M+m)Fm\frac{\left(M+m\right)F}{m}

C

mF(m+M)\frac{mF}{\left(m+M\right)}

D

MF(m+M)\frac{MF}{\left(m+M\right)}

Answer

mF(m+M)\frac{mF}{\left(m+M\right)}

Explanation

Solution

Kx=ma−mFm+MKx=ma-\frac{mF}{m+M}