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The string of pendulum of length l is di...

The string of pendulum of length l is displaced through `90^(@)` from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is

A

mg

B

3 mg

C

5 mg

D

6 mg

Text Solution

Verified by Experts

The correct Answer is:
B
`T=mg +(mv^(2))/(l)=mg+2mg=3mg`,
`where v= sqrt(2gl) "from"(1)/(2) mv^(2)=mgl`
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