. How much energy is gained by a box of mass 20 kg when a man
How much energy is gained by a box of mass 20 kg when a man
(a) carrying the box waits for 5 minutes for a bus?
(b) runs carrying the box with a speed of 3 m/s-1 to catch the bus?
(c) raises the box by 0.5 m in order to place it inside the bus? (g=10 m/s–2)