Two forces act at an angle of to each other

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Two forces act at an angle of

120^{\circ}

to each other. If one force is

8\,\text{N}

and their resultant is

10\,\text{N}

, what is the magnitude of the other force? (a)

6.0\,\text{N}

(b)

10.5\,\text{N}

(c)

11.2\,\text{N}

(d)

8.3\,\text{N}