An electrically powered winch raises a rescue capsule. During one stage of the journey, the capsule rises through a vertical height of 60 m and its speed increases from 2.0 m/s to 8.0 m/s. The capsule has a mass of 500 kg and the winch receives 420 kJ of energy.
Use g=10 N kg−1g=10\ \mathrm{N\ kg}^{-1}g=10 N kg−1.
Calculate the energy transferred to thermal stores of the winch, capsule and surroundings during this stage.