The displacement \( y \) of a wave travelling in the \( x \) - \( \...

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The displacement \( y \) of a wave travelling in the \( x \) -
\( \mathrm{P} \) direction is given by

W \( y=5 \cos \left(300 t-1.5 x+\frac{\pi}{4}\right) \) metre.
Where \( x \) is in metre and \( t \) in seconds. The speed of the wave motion is
(1) \( 200 \mathrm{~m} / \mathrm{s} \)
(2) \( 300 \mathrm{~m} / \mathrm{s} \)
(3) \( 450 \mathrm{~m} / \mathrm{s} \)
(4) \( 600 \mathrm{~m} / \mathrm{s} \)
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