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A roller coaster with mass (m=2500kg) has a speed of 10 m/s as it goes over...

A roller coaster with mass (m=2500kg) has a speed of 10 m/s as it goes over a 13 m hill. When it reached the crest of a second hill 8 m tall, it is traveling at a velocity of 13 m/s. How much work did friction do on the coaster?

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