Question

What is the angle between two forces 2N and 3N having resultant 4N ?

Answer 1

by using formula of resultant force

Answer 2

$Fnet = \sqrt{F^2 + f^2 + 2fFcos∅}$
$4 = \sqrt{ 2^2 + 3^2 + 2.2.3cos∅}$
$16 = 13 + 12cos∅$
$Cos∅ = \frac{1}{4}$
$∅ = arccos \frac{1}{4}$