A person walks 2 m with an acceleration of 5 m s⁻², holding an object of mass 2 kg. The net work done on the object is
Correct answer: A. 20 J
- A. 20 J
- B. 5 J
- C. 10 J
- D. 0 J
Explanation
Net force = ma = 2×5 = 10 N. Work = F d = 10×2 = 20 J. Thus option A is correct.
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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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