Question

6, Two forces act together on an object. The magnitude of their resultant is least when the angle between the forces is: A 0 B. 459 C. 60° D. 180°​

Answer 1

Explanation:

I would say 180 degrees. That is, if two vectors are co-linear but opposite in direction, the magnitude of their vector sum will be the difference between their magnitudes. The smaller (in magnitude) totally cancels out an equal amount of the magnitude of the larger one. If they are equal in magnitude, the resultant will be the null vector (magnitude 0).