A person holds a bucket of weight 60 N. He walks 7 m along the horizontal path and then climbs up a vertical distance of 5 m. The work done by the gravity is:
Correct answer: A. 300 N-m
- A. 300 N-m
- B. 420 N-m
- C. 720 N-m
- D. None of these
Explanation
Gravity does work only for vertical displacement: W = −mg Δh = −60×5 = −300 J (magnitude 300 N·m). Option A gives 300 N·m as magnitude, so it matches.
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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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