Question

A sphere is suspended by a thread of length I. What minimum horizontal velocity has to be imparted to the ball for it to reach the height of the suspension?

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

= potential energy at the height of suspension

$\Rightarrow$ $\frac{1}{2}$$m{v}^2$ = mgl
$\therefore$ v = $\sqrt{2gl}$
Kinetic energy given to a sphere at lowest point