David Sang and Graham Jones Solutions for Chapter: Work, Energy and Power, Exercise 6: Questions

Calculate the velocity for a brass sphere of mass $10 \mathrm{kg}$, and show that you get the same result. Repeat with any other value of mass.

Calculate how much gravitational potential energy is lost by an aircraft of mass $80000 \mathrm{kg}$ if it descends from an altitude of $10000 \mathrm{m}$ to an altitude of $1000 \mathrm{m}$. What happens to this energy if the pilot keeps the aircraft's speed constant?

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