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A rollercoaster of mass 2000 kg starts at rest at the top of an 80...

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A rollercoaster of mass 2000 kg starts at rest at the top of an 80 m high hill and begins his journey. Friction is negligible.a. What is the coaster's potential energy at the top of the 80 m hill?b. What is the coaster's kinetic energy at the top of the 80 m hill?c. What is the coaster's potential energy at the top of a 30 m hill?d. What is the coaster's kinetic energy at the top of a 30 m hill?e. What is the coaster's speed at the top of a 30 m hill?

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