5. The position of a SHM as a function of time is given by $x = 3.8 \cos \left(\frac{5\pi t}{4} + \frac{\pi}{6}\right)$ where $t$ is in seconds and $x$ is in meters. Find: (a) the period and frequency (b) the position and velocity at $t = 0$ s, (c) the velocity and acceleration at $t = 2.0$ s
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