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A particle moves with a speed of $(10 i + 6 j + 2 k) {ms}^{- 1}$ under the influence of a constant Force $F = (2 i - 3 j - k)$ . Find the instantaneous power applied to the particle

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0 W

20 W

10 W

18 W

answer is D.

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Detailed Solution

$\begin{array}{l} P_{i} = \vec{F} \cdot \vec{V} = (10 i + 6 j + 2 k) \cdot (2 i - 3 j - k) \\ = 20 - 18 - 2 = 0 W \end{array}$

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