Calculate how much gravitational potential energy is gained if you climb a flight of stairs. Assume the you have a mass of $52 \mathrm{kg}$ and that the height you lift yourself is $2.5 \mathrm{m}$.

A climber of mass $100 \mathrm{kg}$ (including the equipment she is carrying) ascends from sea level to the top of a mountain $5500 \mathrm{m}$ high. Calculate the change in

her gravitational potential energy.

A toy car works by means of a stretched rubber band. What form of potential energy does the car store when the band is stretched?

Which has more k.e., a car of mass $500 \mathrm{kg}$ travelling at $15{ \mathrm{ms}}^{-1}$ or a motorcycle of mass $250 \mathrm{kg}$ travelling at $30 \mathrm{m}{ \mathrm{s}}^{-1}$?

A high diver (see Figure) reaches the highest point in her jump with her centre of gravity 10m above the water.

A high dive is an example of converting (transforming) gravitational potential energy to kinetic energy.

What is her speed just before the point where she enters the water is

A stone falls from the top of a cliff, $80 \mathrm{m}$ high. When it reaches the foot of the cliff, its speed is $38 \mathrm{m}{ \mathrm{s}}^{-1}$

(a) Calculate the proportion of the stone's initial g.p.e. that is converted to k.e.