Question

Water falls off a cliff of height 20m at a rate of 50kg per second

calculate the mass of water that falls in 1 minute
calculate the gravitational potential energy lost by the water in 1 minute

Answer 1

M = 50 kg / sec * 60 sec = 3000 kg water that falls

PE = M g h initial potential energy of water

PE = 3000 kg * 9.8 m/s^2 * 20 m = 588,000 joules of energy lost