The snowboarder lost potential energy but gained kinetic energy sliding down the

Question

The snowboarder lost potential energy but gained kinetic energy sliding down the hill. Once at the bottom, she removed the board and hiked with it back up the hill to the starting point. Considering only her hike back up the hill, which of these statements are true? 1. Her total mechanical energy was conserved. 2. It took no energy to reach the top. 3. The force pushing her uphill is provided by gravity. 4. Total energy of hiker+Earth was conserved. A. All four statements are true. B. All four are false. C. Only 1, 2, and 4 are true. D. Only 4 is true. E. Only 2 and 4 are true. ? Bowling Ball Pendulum

Explanation / Answer

Only 1, 2, and 4 are true.

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