question_answer

In the arrangement shown, pulleys and strings  are light and frictionless. If the system is  released from rest, the acceleration of m is

A)  g/3                                       

B)  g

C)  g/4                                       

D)  2g

Correct Answer: B

Solution :

 Since the pulley is light, the mass of pulley can be considered as zero is shown here. The Free Body Diagram of pulley is shown here \[2T-T=0\times a\] \[\Rightarrow \]               \[T=0\] Since tension in string comes out to be zero, both the blocks fall under gravity.