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Home  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Motion in a Plane

A ball of mass m is attached to one end of a light rod of length $l$, other end of which is hinged . What minimum velocity 'v' should be imparted to the ball downwards so that it can complete the circle

\[(a)\;\sqrt {gl} \quad (b)\;\sqrt {5gl} \quad (c)\;\sqrt {3gl} \quad (d)\; \sqrt {2gl} \]

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1 Answer

The velocity at top most position of circle must be zero for finding minimum velocity of projection.
$v=0$
$v^2-u^2=-2gh$
$0=u^2-2gh\qquad (h=l)$
$u=\sqrt{2gl}$
Hence d is the correct answer. 

 

answered Jun 27, 2013 by meena.p
edited Jul 25, 2014 by thagee.vedartham
 

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