Timmy is riding waves at the beach and his father determines he is oscillating at 3.0 Hz. A coastguard 200m away sees Timmy's position change by 6.7 degrees between his highest and lowest points. Using trigonometry and the angular frequency, the document calculates Timmy's amplitude as 11.7m. Timmy's maximum velocity is then determined to be 221 m/s by multiplying the angular frequency by the amplitude.