Question

A force F =6xi +2yj displaces a body from
7 = 2î +8j to iz = 5i+4). The work done by
force is​

Answer 1

Given,

body displaces from a point (3,4,6) to a point (7,2,5) .

so, displacement vector,

or,

we know, workdone is the dot product of force and displacement along force.

e.g.,

= 3 × 4 - 4 × -2 + 5 × -1

= 12 + 8 - 5 = 15 J

hence, workdone = 15J

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