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A wave yi = 0.3 cos (2.0x - 40t) is trav...

A wave `y_i = 0.3 cos (2.0x - 40t)` is travelling along a string toward a boundary at x=0. Write expressions for the reflected waves if .
(a) the string has a fixed end at x=0 and
(b) The string has a free end at x=0.
Assume SI units.

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`y(x,t) = 0.3 cos (2.0 + 40 t)` SI units
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