Question

What is the angle between a 2N force and a 3N force so that their sum is 4N

Answer 1

Answer:

angle must be cos–1. 1/4

Answer 2

Answer:

-(1/8)

Explanation:

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

Let the angle between A and B be θ

A=2N

B=3N

R=4N

Now R  

2

=A  

2

+B  

2

+2ABcosθ

So,4  

2

=2  

2

+3  

2

+2×3×4cosθ

So, 16=4+9+24cosθ

So, 16=13+24cosθ

So, 3=24cosθ

So,  

24

3

​  

=cosθ

So, cosθ=1/8

So, θ=cos  

−

1(1/8)