Practise selecting suitable physics formulae, substituting data consistently and checking units while solving energy and mechanics problems.
Which amount of energy is not 2400 J ?
the decrease in gravitational potential energy of a mass of 60 kg when it moves vertically downwards through 40 m near the Earth's surface
the energy transferred in 15 s by a machine of power 160 W
the kinetic energy of a mass of 12 kg moving at a speed of 20 ms−1
the work done by a gas expanding against a constant external pressure of 120 kPa when its volume increases by 0.020 m3
A