A car of mass 1500 kg goes down a hill with a height of 50m. when the car reaches the bottom of the hill the speed is 15 m/s. how much energy was lost due to friction and air resistance? hey, im having trouble with my home work T.T I have no clue how to do it if someone can help, much would be much appreciated. the answer is 566 KJ but i have no clue how to get it. thanks in advance.