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a massless string is attatched to a wall and is shook up and down in a...

a massless string is attatched to a wall and is shook up and down in a sinusoidal manner with a frequency of of 3.0 Hz and an amplitude of 0.090 m. the wave speed on the string is v = 9.0 m/s. at time t = 0. the end not attached to the wall has maximum positive displacement and is instantaneously at rest. assume that no wave bounces back from the wall's end. (A) What is the wave's amplitude, angular frequency, period, and wavelength? (B) What is a wave function describing the wave? (C) What are the equations for the displacement of a point 2.5m from the end being shook at 0.20s?
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