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A force `2hati+3hatj+4hatk` N acts on a body for 4 sec, produces a displacement of `(3hati+4hatj+5hatk)`m. the power used is

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A force `2hati+3hatj+4hatk` N acts on a body for 4 sec, produces a displacement of `(3hati+4hatj+5hatk)`m. the power used is
A. 9.5 W
B. 7.5 W
C. 6.5 W
D. 4.5 W
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Correct Answer - A
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