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1/10 A roller coaster of mass 800 kg starts from rest at the top of a hill with 1,500,000 J of potential energy. It ends

1/10 A roller coaster of mass 800 kg starts from rest at the top of a hill with 1,500,000 J of potential energy. It ends up at ground level moving at 45 m/s. How much energy was lost to heat and friction

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