a) Ekam and Axita are running up the stairs in a fitness challenge. Ekam (mass 55.0 kg) runs up the flight of stairs (2.40 m) high in a time of 3.10 seconds. Determine her change in gravitational potential energy and the power she exerted in running up the stairs [4].
b) Ekam exerted 2000.0 J of chemical energy in running up the stairs. Identify her input energy [3].
c) A bungee jumper has a mass of 73 kg and falls a distance of 120 m before the bungee catches and sends the jumper upward. Use the law of conservation of energy to calculate the speed of the jumper just before the bungee catches. [5].