What is the oscillation frequency? What is the maximum speed acquired by the block? At what value of x does this occur? What is the maximum acceleration of the block? At what value of x does it occur? What forces must be applied to the block to give it this motion

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Oscillation is the repetitive variation, typically in time, of some measure about a central value between two or more different states. Familiar examples include a swinging pendulum and AC power. The term vibration is sometimes used more narrowly to mean a mechanical oscillation but sometimes is used to be synonymous with "oscillation". Oscillations occur not only in physical systems but also in biological systems, in human society and the brain.
One oscillation is one complete to and fro motion of bob from its mean position. The time taken to cover this one complete motion is defined as the time period of the oscillation.