A force of 3i +2j+4k N gives displacement of 10 jm. The work done is:
Correct answer: A. 20 J
- A. 20 J
- B. 32 J
- C. 26 J
- D. Zero
Explanation
W = F . d= (3 i + 2 j + 4 k) . (10 j)W = 20 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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