A ball of mass $m$ is projected vertically upwards in air with an initial velocity $v$ to a height $h$, as illustrated. Air resistance may be ignored. The acceleration of free fall is $g$. What is the total work done by the gravitational force on the ball while it moves from $P$ to $Q$?
- Azero
- B$\frac{1}{2}mv^2$
- C$mgh$
- D$2mgh$