Question

A force of Acosθ=A.B/|B| and Bcosθ=A.B/|A| n acts on a body for 4 s and produces a displacement of 3i+4j+5k m calculate the power.
1) 5 w 2) 6 w 3) 7 w 4) 9 w​

Answer 1

Work done = F.s = (2i+3j+2k).(3i+4j+5k) = 2.3 + 3.4+2.5 = 6+12+10=28 J

Power = Energy/time

Energy = Work done

Thus,

Power = 28/4 = 7 W

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Answer 2

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7 watts