A painter of mass M stands on a platforms of mass m and pulls himself up by two ropes which hang over pulley as shown in fig. He pulls each rope with force F and moves upward with uniform acceleration a, find a (neglecting the fact that no one could do this for long time).

Options

A. `g//2`
B. `g//4`
C. `g`
D. zero

Answer

D

Explanation

For (man+ platform) system
`2mg-4T=2ma`
`rArr 2mg-4((mg)/2) =2m(a) [ :' T=(mg)/2]`
`rArr a=0`