Chapter 7 - Applications of Trigonometric Functions - Section 7.5 Simple Harmonic Motion; Damped Motion; Combining Waves - 7.5 Assess Your Understanding - Page 574: 1

Amplitude, $A=|5|=5$ and period: $T=\dfrac{2\pi}{4}=\dfrac{\pi}{2}$

When the function has the form $y=A\sin{(\alpha x)}$, then $|A|$ denotes the amplitude and $T $ represents the period. The period $T$ can be computed as: $T=\dfrac{2\pi}{\omega}$. Here, we have: Amplitude, $A=|5|=5$ and period: $T=\dfrac{2\pi}{4}=\dfrac{\pi}{2}$