A ball of mass $m\,$ is projected vertically upwards from the ground with an initial speed $u$ . The ball reaches a maximum height $H$ .

As it rises, air resistance acts on the ball, causing some of its initial energy to be transferred to the surroundings.

Which expression gives the work done against the air resistance during the ball's rise to its maximum height?

$12mu2−mgH\frac{1}{2}mu^2 - mgH$

$12mu2\frac{1}{2}mu^2$

$12mu2+mgH\frac{1}{2}mu^2 + mgH$

A ball of mass $m\,$ is projected vertically upwards from the ground with an initial speed $u$ . The ball reaches a maximum height $H$ .

As it rises, air resistance acts on the ball, causing some of its initial energy to be transferred to the surroundings.

Which expression gives the work done against the air resistance during the ball's rise to its maximum height?

$12mu2−mgH\frac{1}{2}mu^2 - mgH$

$12mu2\frac{1}{2}mu^2$

$12mu2+mgH\frac{1}{2}mu^2 + mgH$

1.7 Energy, work and power

1.7 Energy, work and power Questions