When velocity of body of mass 10 kg is increased from 2 ms-1 to 8 ms-1 then the work done of the body is:
Correct answer: C. 300 J
- A. 100 J
- B. 200 J
- C. 300 J
- D. 400 J
Explanation
Work done = change in KEWork done = 1/2 m (v22 - v12)Work done = 1/2 x 10 x (82 - 22)Work done = 1/2 x 10 x (64 - 4)Work done = 300 J
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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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