Question

A block of mass $M$ is pulled along horizontal frictionless surface by a rope of mass $m$. Force $P$ is applied at one end of rope. The force which the rope exerts on the block is

Answer 1

Acceleration of system $=\frac{P}{M+m}$

Force on the block= Mass of block $\times$ Acceleration of system

$=M\times \frac{P}{M+m}$

$=\frac{PM}{M+m}$