How to find work done
Force x distance
How to find kinetic energy
Ek = 1/2 x m x velocity ^2
How to find GPE
GPE = m x g x h (difference)
How to find elastic potential
Ee = 1/2 x k x e ^2
How to find energy efficiency
Energy efficiency = Useful output / total imput
How to work out power (watts)
Power = energy / time