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A body crosses the topmost point of a vertical circle with critical speed. What will be its centripetal acceleration when the string is horizontal:

a} 1g

b} 2g

c} 3g

d} 4g
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The correct answer is c) 3g 

\(V=\sqrt{3gr}\) 

\(a={v^2\over r}\) 

Then ,  

\(a={3gr\over r}= 3g\) 

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