A 50 kg person climbs 30 steps each 15 cm high in 10 s. Power (g=10) is MCQ with Answer and Explanation

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A 50 kg person climbs 30 steps each 15 cm high in 10 s. Power (g=10) is

A. 150 W

B. 300 W

C. 2250 W

D. 225 W

Answer: Option D

Solution (By JKSSB Mock Tests)

Height = 30×0.15=4.5 m. Work = 50×10×4.5=2250 J. Power=2250/10=225 W.

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The heating effect of electric current is utilised in

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Correct Answer: Option A

Explanation:
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Potential energy: gravitational (mgh), elastic (½kx²). Kinetic energy due to motion. Total mechanical energy sum conserved in conservative forces.

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