A wave in a string has an amplitude of ...

A wave in a string has an amplitude of 2cm.The wave travels in the +ve direction of x axis with a speed of `128m//sec`.and it is noted that 5 complete waves fit in 4m length of the string. The equation describing the wave is:

y=(0.02) m sin(15.7x-2010t)

y=(0.02) m sin(15.7x+2010t)

y=(0.02) m sin (7.85x-1005t)

y=(0.02) m sin (7.85x+1005t)

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