Question

A simple pendulum of length $l$ has maximum angular displacement $\theta$. The maximum kinetic energy of the bob of mass $m$ is ($g =$ acceleration due to gravity)

• A. $mgl (1 + cos\,?)$
• B. $mgl (1 + cos^2\, ?)$
• C. $mgl (1 - cos \,?)$
• D. $mgl (cos\,? - 1)$

Answer 1

Answer: (C)

$mgl (1 - cos \,?)$

Answer 2

When bob is at rest, the pendulum has only potential energy which is given as $P.E=mgl$