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A body attached at one end of a strin...

A body attached at one end of a string crosses the topmost point of a vertical circle with the critical speed Its centripetal acceleration , when the string is horizontal will be

A

g

B

3g

C

5g

D

6g

Text Solution

Verified by Experts

The correct Answer is:
B

when the body is just able to complete a vertical circle of radius r its velocity at the topmost point B is `sqrt( g r) ` and its velocity is ` c=` velocity at D `=sqrt( 3 gr ) `
` therefore ` Its centripetal acceleration ` C= (v^2)/(r ) = ( 3 gr ) /( r ) = 3g `
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