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• Topic:

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A force of $2\stackrel{^}{i}+3\stackrel{^}{j}+4\stackrel{^}{k}\text{\hspace{0.17em}}N$ acts on a body for 4 second, produces a displacement of $\left(3\stackrel{^}{i}+4\stackrel{^}{j}+5\stackrel{^}{k}\right)m.$ The power used is

(1) 9.5 W

(2) 7.5 W

(3) 6.5 W

(4) 4.5 W