The amplitude of a particle executing `SHM` about `O` is `10cm`. Then `:`
A. when the `K.E.` is `0.64` of its maximum `K.E.` its displacement is `6cm` from `O`.
B. when the displacement is `5cm` from `O` its `K.E.` is `0.75` times its maximum `K.E.`
C. Its total energy of `SHM` at any point is equal to its maximum `K.E.`
D. Its speed is half the maximum speed when its displacement is half the maximum displacement.
