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An engine exerts a force $F = (20 \hat{i} - 3 \hat{j} + 5 \hat{k}) N$ and moves with velocity $v = (6 \hat{i} + 20 \hat{j} - 3 \hat{k}) {ms}^{- 1}$ . The power of the engine (in watt) is

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Correct option is A

Power of the engine,P=F·v=(20i^-3j^+5k^)·(6i^+20j^-3k^)= 120 - 60 - 15 = 45 W

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An engine exerts a force F=(20i^-3j^+5k^)N and moves with velocity v=(6i^+20j^-3k^)ms-1. The power of the engine (in watt) is

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An engine exerts a force $F = (20 \hat{i} - 3 \hat{j} + 5 \hat{k}) N$ and moves with velocity $v = (6 \hat{i} + 20 \hat{j} - 3 \hat{k}) {ms}^{- 1}$ . The power of the engine (in watt) is