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I know the answer to the following is A but I don't know why it is positive 2.06 m/s.เ) TH PROPER ETRIC UNITS , y(x, t)-0. 58 . sin (32 x _ 21 r t ) a Siv 人 CERTAIN MEDI u M. THE VELOCITY OF THE WAVE THRouGH TH

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wave No 2 乞 0:186 m 32- if hene is means ouveliing intax e. reguenc means ve

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