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## Homework Statement

a man with mass m=66kg is standing on top of a platform with mass M=120kg. The man is pulling himself up using a pair of ropes suspended over massless pulleys. he pulls each rope with force of F=600N and is accelarating towards the ceiling at acceleration a. g=9.8 m/sec^2. find the value of a in m/sec^2.

* - pulley

## Homework Equations

[tex]\sum F = ma[/tex]

## The Attempt at a Solution

I tried treating the man and the platform as one body but i got negative acceleration, as if the man was accelerating away from the ceiling. I would like to see how you guys solve this problem.