JAMB Physics 2009 Objective — Question 3

Question 3 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2009 Objective paper, with the correct answer and a full explanation.

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

A. 0°
B. 45°
C. 90°Correct
D. 180°

Explanation

R² = a² + b² - 2ab cos(180-θ). 169 = 144+25-120cos(180-θ). cos(180-θ)=0, so 180-θ=90, giving θ=90°.

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