A particle of mass `m` performs `SHM` along a stright line with frequency `f` and amplitude `A`.
A. The average kenetic energy of the particle is zero.
B. The average potential energy is `m pi^(2)f^(2)A^(2)`.
C. The frequency of ocillation of kinetic energy is `2f`.
D. Velocity funciton leads acceleration by `pi//2`.