Answer: 15 J
Explanation:
The work done in lifting the box is equal to the gain in gravitational potential energy of the box, equal to
[tex]W=Fd[/tex]
where
F=30 N is weight of the box
d=0.5 m is the distance through which the box has been lifted
By substituting the numbers into the equation, we find
[tex]W=(30 N)(0.5 m)=15 J[/tex]
