A ball, starting at point X, rolls down the hill shown in the diagram. At which point does the ball have half of its maximum kinetic energy? (Ignore friction)
Correct answer: C. C
- A. A
- B. B
- C. C
- D. D
Explanation
Gain in kinetic energy = loss in gravitational potential energy. The ball will have maximum kinetic energy at the bottom of the hill. At point C. the ball is about midway to the bottom of hill. Hence at C, the ball will have half of its maximum kinetic energy.
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Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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