PLEASE SOLVE:
(1) A stone of mass, m=10kg falls from a height of 10m. If the acceleration due to gravity is 10m/s^2 , determine the decrease in potential energy of the stone.
(2) An engine pulls a train with a force of 10,000N so that the train moves with a speed of 10m/s. Calculate the power developed by the engine in kilowatts.