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Q.

A frictionless track ABCDE ends in a circular loop of radius R. A body slides down the track  from rest at point A which is at a height h = 5 cm. Maximum value of R for the body to successfully complete the loop is 
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a

5cm

b

2cm

c

103cm

d

154cm

answer is B.

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Detailed Solution

12mv2=mgh(∵v=5Rg)12m(5Rg)=mghh=5R2R=25×h=2cm

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