Question

A simple pendulum 1m long has a Bob of 10kg. If the pendulum swings from a horizontal position, the KE of the Bob at the instant it passes through the lowest position of it's path is

Answer 1

By law of energy conservation,
first at the horizontal position only potential energy
mgh=100
but when at the lowest position only kinetic energy(no height), as total energy is conserved.
mgh+0=k.e.+0
k.e.=100