Posted by **Fiyin** on Friday, October 12, 2012 at 1:05am.

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a constant force equal to (5i+2j)N moves a particle through a displacement S=(2i+3j). Calculate the workdone by the force. At what angle to the horizontal was the force applied?

- Physics -
**drwls**, Friday, October 12, 2012 at 9:33am
The work done is the dot product of force and displacement vectors, which is

5*2 + 3*2 = 16 Joules

If the j component is up and the i component is horizontal, the force angle from the horizontal is arctan(2/5) = 21.8 degrees.

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