a roller coaster trolley and its passengers have a mass of 840 kg. the trolley comes over the top of the first hill with a speed of 0.200 m/s. the hill is 85.0 m above the ground. the trolley goes down the first hill and up to the crest of the second hill 64.0 m above the ground. ignore the effect of frictional forces. what is the kinetic energy of the trolley at the top of the second hill?

fgk200    2   09.11.2021 17:36    6