Kinetic energy of a body moving with speed of 10 m s-1 is 30 J. If its speed becomes 30 m/s its K.E will be:
Correct answer: D. 270 J
- A. 10J
- B. 180 J
- C. 90 J
- D. 270 J
Explanation
K.E₁ / K.E₂ = v₁² / v₂²K.E₂ = K.E₁ (v₂² / v₁²)K.E₂ = 30 × 900 / 100 = 270 J
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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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