Physics

Problem

The displacement of a particle undergoing simple harmonic motion is given by

x = 0.12\cos\bigl(6\pi t - \tfrac{\pi}{4}\bigr)

, where x is in meters and t in seconds. What is the earliest positive time t at which the acceleration attains its maximum positive value? a)

0.042\,\text{s}

0.125\,\text{s}

0.208\,\text{s}

0.292\,\text{s}