Unsure where to start here really.
The forces F1 = (ai - 2aj)N and F2 = (2i + 4j)N act on a particle. The resultant of F1 + F2 has magnitude 4N. Find the possible values of a.
Thanks for any help
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You know how to add the vectors?
And how to take the magnitude?
F1+F2=(a+2)i + (4-2a)j
Now solve for a.
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