desteyness35 desteyness35

19-07-2017
Mathematics

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Find the work done by a force fâ =1.8i^+2.2j^n as it acts on an object moving from the origin to the point râ =56i^+31j^m.

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LammettHash LammettHash

19-07-2017

Take the dot product:

[tex]W=\mathbf F\cdot\mathbf r=(1.8\,\mathbf i+2.2\,\mathbf j)\cdot(56\,\mathbf i+31\,\mathbf j)[/tex]
[tex]W=169\,\text{Nm}[/tex]

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