A 1 kg block is lifted vertically 1 m by a boy. The work done by the boy is

If the force acts vertically then
work done = potential energy either mgh
where
m= 1kg
​g= 9.8m/s2
h = 1m
​so, mgh= 1 x 9.8 x 1
which is equal to
9.8Nm or 9.7J