question_answer

A person of mass m is standing a on a structure made up of pulley, strings and platform as shown in figure. Find the force exerted by the person on the rope, so that the system (person structure) remains in equilibrium.          

A)  mg                             

B) \[(m+M'+M)g\]

C) \[\frac{(M+M'+m)g}{2}\]     

D)  None of these

Correct Answer: C

Solution :

The net force on the system can be calculated directly after drawing the free body diagram.