Measure Wave Amplitude Practice Test

A water wave passes by a dock. The water surface at rest is the equilibrium position. The highest point of the wave is $5\text{ cm}$ above the calm surface and the lowest point is $5\text{ cm}$ below it. What is the amplitude of the wave?

A pendulum’s equilibrium position is straight down at $\theta=0^\circ$. It swings to a maximum of $15^\circ$ to the left and $15^\circ$ to the right. What is the amplitude of the pendulum’s motion?