Answer
(a) $2.4$, $\frac{5\pi}{9}$, $\frac{9}{5\pi}$.
(b) see graph.
Work Step by Step
(a) Given $y=2.4sin3.6t$, we can find the amplitude as $2.4$, period as $\frac{2\pi}{3.6}=\frac{5\pi}{9}$, and frequency of the motion as $\frac{9}{5\pi}$.
(b) see graph.