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Help 3. A 1500 kg roller coaster begins at a speed of 5.0 m/s and a height of 45 m above the ground. It rolls

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3. A 1500 kg roller coaster begins at a speed of 5.0 m/s and a height of 45 m above the ground. It rolls down the track to ground level. Assume there is no friction for part a. only. What is the speed of the roller coaster when it makes it to ground level? (2 marks) Er b. If the actual speed of the rollercoaster is 20 m/s at ground level, how much energy is lost to friction? (2 marks)

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