STANDARD Physics Power MCQ Question
A force (4î + ĵ - 2k̂) N acting on a body maintains its velocity at (2î + 2ĵ + 3k̂) m s⁻¹. The power exerted is
4 W
5 W
2 W
8 W
Correct Answer
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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