A 1 kg block is lifted vertically 1 m by a boy. The work done by the boy is
Here Work done is against to gravity
so; Work done=mgh
m = 1kg
g = 10 m/s2
h = 1m
w=mgh
=1*10*1
=10J
so; Work done=mgh
m = 1kg
g = 10 m/s2
h = 1m
w=mgh
=1*10*1
=10J