The amplitude of a particle executing SHM about `O` is `10 cm`. Then
A. When the `K.E.` is `0.64` of its max. `K.E.` its displacement is `6cm` from `O`.
B. When the displacement is `5 cm` from `O` its `K.E` is its max. `P.E.`
C. Its total energy at any point is equal to its maximum `K.E.`
D. Its velocity is half the maximumum velocity when its displacement is half the maximum displacement.
