A person walks 2m with an acceleration of 5m/s2, holding an object of mass 2kg. The work done on the object is:
Correct answer: A. 20 J
- A. 20 J
- B. 10 J
- C. 5 J
- D. 0 J
Explanation
The explanation of this question is: Work = force x distance Force = mass x acceleration F = 2 x 5 = 10N W = 10 x 2 = 20J
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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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