Answer
(a) $2$, $\frac{2\pi}{3}$, $\frac{3}{2\pi}$.
(b) see graph.
Work Step by Step
(a) Given $y=2sin(3t)$, we can identify the amplitude as $2$, period as $\frac{2\pi}{3}$, and frequency of the motion (the reciprocal of the period) as $\frac{3}{2\pi}$.
(b) see graph.