An 80 Kg man standing on the platform of mass 20 Kg is lowering himself down using a massless cable passing over two pulleys as shown. If his...

An 80 Kg man standing on the platform of mass 20 Kg is lowering himself down using a massless cable passing over two pulleys as shown. If his downward acceleration is 0.2 m/s2, find the force exerted by the man on the cable.