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Let T be tension in rope
and a be accln of blocks
since 3kg is heavier one, it will tend to fall due to gravity
so, on balancing eqns, we have a= (m1-m2).g/(m1+m2)
T = 2m1.m2.g/(m1+m2)
so T = 24 N and a = 2 m/sec2
at 4th second, after free fall , it falls a distance S = 1/2*2*16 = 16 m
work done by gravity = mgh = 3*10*16 = 480 J
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