Posted by **hi,** on Thursday, January 17, 2008 at 11:20pm.

im not sure how to do this question

80 N and 60 N force act concurrently on a point. find magnitude of the vector sum if the forces pull

-in the same direction

-in opposite direct.

-at right angles to each other

thanks

- physics -
**bobpursley**, Thursday, January 17, 2008 at 11:24pm
We will be happy to critique your thinking on this.

- physics -
**hi,**, Thursday, January 17, 2008 at 11:30pm
i don't understand..

do u use cos and sin?

i don't understand the question.

- physics -
**drwls**, Friday, January 18, 2008 at 7:30am
You don't need to use cosines and sines for this. If the forces are in the same direction, that add. If they are in opposite directions, subtract one from the other. If they are at right angles, use the Pythagorean theorem

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