A small hevy block is attached to the lower4 end of a light rod of lenth l which fan be rotated about its clamped upper end. What minimum horizontal velocity should the block be given so that it moves in a complete vertical circle ?

Answer

B

Explanation

Let the velocity of the body at AL is for minimum velocity given ta velocity of the body at point B is zero.


Applying law of conservation of energy at A and B
`1/2 mv^2=mgh`
`1/2mv^2=mg(2L)`
`rarr v=sqrt((4gL))=2sqrt(gL)`