**A.**

For a harmonic motion, the displacement equation is:

$\overline{){\mathbf{x}}{\mathbf{=}}{\mathbf{A}}{\mathbf{c}}{\mathbf{o}}{\mathbf{s}}{\mathbf{\left(}}\frac{\mathbf{2}\mathbf{\pi}}{\mathbf{T}}{\mathbf{t}}{\mathbf{\right)}}}$

The position of a mass oscillating on a spring is given by x = ( 3.6 cm) cos[2πt/(0.67s)].

A. What is the period of this motion?

T=? s

B. What is the first time the mass is at the position x = 0?

t=? s

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