3. When starting a race, a 680 kg vehicle runs the first 1000 m in 3 minutes, starting from rest and accelerating uniformly a) What is the speed of the runner at the end of the 3 minutes? b) What is its kinetic energy? c) What average power does the engine generate during the 3-minute interval?

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A: Given: mass of an object, m = 20 kginitial speed, vi = 3 m/sfinal kinetic energy, KEf = 122 J

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A: (a) The kinetic energy of the runner is, KEi=12mv2=1268.5 kg3.00 m/s2=308.25 J=3.08×102 J

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Q: A hydroelectric generator converts kinetic energy of water into electrical energy. Each second 2974…

A: a) The total energy available is, TE=efficiencymgh=0.732974 m31000 kg1 m39.80 m/s2133 mTE=2.83×109 J

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