Question

the magnitude of resultant of two forces 9 N and 12 N is 15 N, calculate the angle between the two forces.​

Answer 1

Explanation:

9+12= 21

but resultant 9+12×cos 45°= 9+6= 15

the angle will be 45° as cos 45°=1/2

force 12N will be 45° to force 9N