please solve this.....

Asked by  | 1st Aug, 2009, 04:29: PM

Expert Answer:

Work done is the dot product of force vector and displacement vector.

W = work done, F = force = Fxi + Fyj + Fzk ; S = displacement = Sxi + Syj + Szk

W = F.S = FxSx + FySy + FzSz

Hence using component form of dot product,

work done = (5)(9) + (3)(4) = 57 J

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Answered by  | 1st Aug, 2009, 10:27: PM

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