A body of mass 2 kg is moving at 3 m/s. What is its kinetic energy?
Correct answer: D. 18 J
- A. 3 J
- B. 6 J
- C. 9 J
- D. 18 J
Explanation
This is correct because KE = ½ × 2 × (3²) = ½ × 2 × 9 = 9 J.
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About Kinetic Energy
Kinetic energy is the energy of motion, given for a nonrelativistic object by K = ½mv², so it depends on mass and the square of speed. Questions connect kinetic energy with work through the work energy theorem, calculate changes in kinetic energy, and distinguish it from momentum and potential energy.
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