The resultant of two forces 12N and 5N is 13N. What is the angle between the two forces?

A. 0°
B. 45°
C. 90°
D. 180°

Correct Answer:

Option C = 90°

Explanation

R² – P² + Q² = 12² + 5²
= 144 + 25 = 169
∴R = √169 = 13N
∴ angle between the forces is 90°