In a transverse wave the distance between a crest and neighbouring trough at the same instant is $4.0\, cm$ and the distance between a crest and trough at the same place is $1 .0\, cm$ . The next crest appears at the same place after a time interval of $0.4\,s$. The maximum speed of the vibrating particles in the medium is
JEE MAIN 2013, Diffcult
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