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Given vector a with an angle of 15 degrees from the x-axis, vector b with an angle of 25 degrees from the other side of the x-axis, and 100N as a resultant force, find the forces applied by the vectors

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closed as off-topic by Zain Patel, Siong Thye Goh, Leucippus, C. Falcon, Shailesh Jun 6 '17 at 0:57

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  • $\begingroup$ What do you mean by other side of x axis? 25 degrees from negative x axis? $\endgroup$ – mathnoob123 Jun 5 '17 at 22:38
  • $\begingroup$ yes, something like that $\endgroup$ – jrdp1803 Jun 5 '17 at 22:39
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Sum of forces $$ F_1 \cos 15 + F_2 \cos 65 = 100 \tag{1} $$

Law of cosines $$ 100^2 = F_1^2 + F_2^2 - 2 F_1 F_2 \cos 140 \tag{2} $$

Try drawing the diagram.

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