Question

The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

• A. 60${}^{\circ }$
• B. 120${}^{\circ }$
• C. 150${}^{\circ }$
• D. 90${}^{\circ }$

Answer 1

Answer: (B)

$\mathrm{Cos}\theta =\frac{P}{2P}$
$\theta =60^{\circ }$
angle between force $P$ and $2P$ is $120^{\circ }$