Moderate
If 10 kg mass is dropped from a certain height, hits the ground with speed 10 ms⁻¹. The height will be
Correct answer: D. 5 m
- A. 100 m
- B. 10 m
- C. 50 m
- D. 5 m
Explanation
Using ½ v² = g h ⇒ h = v²/(2 g) = 100/(2×9.8) ≈ 5.10 m ≈ 5 m. So option D 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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