Problem

A simple pendulum of length

l

and bob of mass

m

is displaced from its equilibrium position

O

to a position

P

so that height of

P

above

O

h

. It is then released. What is the tension in the string when the bob passes through the equilibrium position

O

? Neglect friction.

v

is the velocity of the bob at

O

. a.

m \left( g + \frac{v^2}{l} \right)

\frac{2mgh}{l}

mg \left( 1 + \frac{h}{l} \right)

mg \left( 1 + \frac{2h}{l} \right)