A roller-coaster car with a mass of 1200 kg starts at rest, Physics

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A roller-coaster car with a mass of 1200 kg starts at rest

A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. If the work done against friction between the starting point and point B is 40,000 J (40 kJ), what is the kinetic energy of the car at point B?

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Physics: A roller-coaster car with a mass of 1200 kg starts at rest

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