Consider the situation as shown in the figure. The boy of mass `M` holds the light rope and the system is at rest. If `m` is mass of the box, find the force exerted by the boy on the rope and contact force beteween the boy and the box.

Explanation

Boy

`T+N_(0)-M_(g)=0`
Box`:`

`T=N_(0)-mg=0` (ii)
Solving (i) and (ii), we get
`T=((M+m)g)/(2),N_(0)=((M-m)g)/(2)`
`T:` force exerted by the boy.
`N:` contact force between the boy and the box.
Note `:` Whenever bodies are in contact, always transfer normal reaction, not weight.