A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force F is applied at the free end of the rope, the net force exerted on the block will be:

Options

A. `(PM)/(M+m)`
B. `(Pm)/(M+m)`
C. `(Pm)/(M-m)`
D. P

Answer

a

Explanation

Here F`=("Applied force xx Mass (M)")/ ("Mass of block + mass of rope")`
`F=(PxxM)/(M+m)`
Hence choice is (a)