WAEC Physics 2025 Objective — Question 38
Question 38 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.
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The force and velocity of a system are each reduced simultaneously by one-half. The power of the system is
- A. Doubled
- B. Reduced by a quarterCorrect
- C. Reduced by half
- D. Constant
Explanation
P = F×V. Halving both F and V gives P' = (F/2)×(V/2) = FV/4, i.e. power is reduced to a quarter of its original value.
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