Q. A sphere is suspended by a thread of length $l$. The minimum horizontal velocity which has to be imparted to the sphere for it to reach the height of suspension is
A) $2\sqrt{gR}$
B) $\sqrt{2gl}$
C) $2\ g\ l$
D) $g\ l$
Explanation
(b) To reach the height of suspension, $h = l$
$v = \sqrt{2gh} = \sqrt{2gl}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.