Question

Section - B
11. What is angle between two forces of 2N and 3N having resultant as 4N.
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Answer 1

ANSWER:-Let the two vectors be A and B, and their resultant be R.

Let the angle between A and B be θ.

Using R ^2=A ^2+B ^2+2ABcosθ

(4)^2=2^2+3^2+2×3×4cosθ

2+2×3×4cosθ16=4+9+24cosθ

2+2×3×4cosθ16=4+9+24cosθ16=13+24cosθ

3=24cosθ

3/24=cosθ

θ=cos −1(1/8)