Physics, 25.03.2021 06:40, 81074

3. A roller-coaster car is moving over the top of a hill. At the instant it is on the hill top, it has a kinetic energy of E and a gravitational potential energy of 3E. When it coasts down to ground level, if total mechanical energy is conserved, what is the kinetic energy of the car on the ground?
(A) 4E (B) 3E (C) 2E (D) E

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3. A roller-coaster car is moving over the top of a hill. At the instant it is on the hill top, it h...