- DEp= change in gravitational potential energy in joules (J)
- m = mass in kilograms (kg)
- g = gravitational field strength in newtons per kilogram ( N kg-1)
- Dh = change in height in metres (m)
- Ek = kinetic energy in joules (J)
- m = mass in kilograms (kg)
- v = velocity in metres per second (ms-1)
