A block of mass $M$ is pulled along a horizontal frictionless surface by a rope of mass $m$. If a force $P$ is applied at the free end of the rope, the force exerted by the rope on the block is-
A block of mass $M$ is pulled along a horizontal frictionless surface by a rope of mass $m$. If a force $P$ is applied at the free end of the rope, the force exerted by the rope on the block is-
- A
$\frac{{Pm}}{{M + m}}$
- B
$\frac{{Pm}}{{M - m}}$
- C
$P$
- D
$\frac{{PM}}{{M + m}}$
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