A ball of mass $m$ is projected upwards to a height $h$ in air with initial velocity $v$, as illustrated. The effect of air resistance is negligible. The acceleration of free fall is $g$. How much total work is done by the gravitational force on the ball as it travels from P to Q?
- Azero
- B$\tfrac{1}{2}mv^2$
- C$mgh$
- D$2mgh$