A boy uses a single string pulley system to lift a mass of 20kg moving...

JAMB 2025

A boy uses a single string pulley system to lift a mass of 20kg moving with a velocity of 5ms\(^{-1}\). What is the power developed by the boy if g = 10ms\(^{-2}\)?

A. 100W
B. 1000W
C. 250W
D. 40W

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Correct Answer: Option B

Explanation

Answer: B. 1000W

(Fixed pulley: force = mg = 200 N; power = F × v = 200 × 5 = 1000 W.)

There is an explanation video available below.

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A boy uses a single string pulley system to lift a mass of 20kg moving...

Correct Answer: Option B

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