Correct Answer: Option C

Explanation

R\(^2\) = P\(^2\) + Q\(^2\) = 12\(^2\) + 5\(^2\)
= 144 + 25 = 169
∴R = \(\sqrt{169}\) = 13N
∴ the angle between the forces is 90º

There is an explanation video available below.

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