A stone of 1 kg tied up with 10/3 meter long string rotated in a vertical circle. If the ratio of maximum & minimum tension in string is 4 then speed of stone at highest point of circular path will be - (g = 10 m/s 2 )
A
20 m/s
B
m/s
C
m/s
D
10 m/s
Text Solution
Verified by ExpertsThe correct answer is:
D
= 
mu 2 – 
mv2 = 2 mg λ
u 2 – v 2 = 4g λ
u 2 = 4g λ + v 2
4 v 2 – 4g λ = u 2 + g λ
4 v 2 – 4g λ = 4 g λ + v 2 + g λ
3v 2 = 9 g λ v = 
= 
= 10 m/s
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