WAEC Physics 2018 Objective — Question 34
Question 34 of 50 from the West African Examinations Council (WAEC) Physics 2018 Objective paper, with the correct answer and a full explanation.
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When the speed of a car is halved, its kinetic energy is
- A. doubled
- B. quarteredCorrect
- C. halved
- D. quadrupled
Explanation
K.E. ∝ v². Halving v reduces K.E. to (½)² = ¼ of its original value — i.e. quartered.
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