Question

The string of a simple pendulum is horizontal. Now the string is released. The tension in the string in the lowest position is:

• A. 2 mg
• B. 6 mg
• C. 3 mg
• D. 4 mg

Answer 1

The correct option is C 3 mg

If string length is $L$,

Conserving energy, velocity at lowest point is $(2gL{)}^{1/2}$

Centripetal force $m{v}^2/l$

$=2mg.$

$T-mg=m{v}^2/L$

$T=3mg$

Hence,

option $C$ is correct answer