STANDARDPhysics-Work, Energy and Power

STANDARD Physics Power MCQ Question

Type: MCQ-numerical-Medium-Class 11

A force (4î + ĵ - 2k̂) N acting on a body maintains its velocity at (2î + 2ĵ + 3k̂) m s⁻¹. The power exerted is

A

4 W

B

5 W

C

2 W

D

8 W

Correct Answer

Option A

Detailed Explanation

The power exerted is calculated using the dot product of force and velocity: P = F·v = (4î + ĵ - 2k̂) · (2î + 2ĵ + 3k̂) = 8 + 2 - 6 = 4 W.

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