Question

A simple pendulum 1 metre long has a bob of 10 kg. If the
pendulum swings from a horizontal position, the K.E. of the
bob, at the instant it passes through the lowest position of
its path is
(a) 89 joule (b) 95 joule
(c) 98 joule (d) 85 joule

Answer 1

we can use energy conservation

first at the horizontal position only potential energy

mgh=100

but when at the lowest position only kinetic energy(no height)

mgh+0=k.e.+0

k.e.=98