How do i show on a wave function that an element at x = 2.00 m executes harmonic motion?

Deelan Tapia

New member
A wave on a string is described by the wave function y = 0.100 sin(0.50x - 20t), where x and y are in meters and t is in seconds. (a) Show that an element of the string at x = 2.00m executes harmonic motion.
 
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