Question

A body is acted upon by force F=-12i+5j work done by force in mopving the body from orgin to point coordinates of which are (5,4)

Answer 1

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Answer 2

Explanation:

We know that, Work done by a constant force is given by :

W = F. s

s = Position vector of point wrt initial point.

Here,

F = -12i + 5j

s = (5-0)i + (4-0)k = 5i + 4j

W = F. s.

= -12 * 5 + 5 * 4

= -60 + 20

= -40Joules .

Hence, Work Done required is -40J.

Negative Sign indicates angle between Force vector and displacement vector is obtuse.

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