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The equation of a travelling wave is ...

The equation of a travelling wave is
`y(x, t) = 0.02 sin ((x)/(0.05) + (t)/(0.01)) m`
Find (a) the wave velocity and
(b) the particle velocity at `x = 0.2 m and t = 0.3 s`.
Given `cos theta = -0.85`, where `theta = 34 rad`

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