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Calculating Friction Using Coeffcients

A particle of...

Question

A particle of mass m connected with the help of string of length $l$ is released from rest, when string is horizontal. Tension in string when particle is at lowest point, is

A

2 m g

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B

\frac{4}{3} m g

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C

3 m g

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D

m g

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Solution

The correct option is C $3 m g$
$\frac{1}{2} m v^{2} = m g l$

$T - m g = \frac{m v^{2}}{l}$

$T = 3 m g$

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