Moderate
A 2 kg block is thrown upward from a point 20m above Earth's surface. At what height above Earth's surface will the gravitational potential energy of the Earth-block system have increased by 500 J? (g = 10 m/s2)
Correct answer: C. 25m
- A. 5m
- B. 45m
- C. 25m
- D. 70m
Explanation
Gravitational potential energy is given by P.E = mgh 500 = (2)(10)h → h = 500 / 20 = 25 m
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About Work and Energy
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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