Question

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. $\frac{\left(M+m\right)F}{m}$
• C. $\frac{mF}{\left(m+M\right)}$
• D. $\frac{MF}{\left(m+M\right)}$

Answer 1

Answer: (C)

$Kx=ma-\frac{mF}{m+M}$