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The equation of a wave motion (with t in...

The equation of a wave motion (with t in seconds and x in metres ) is given by `y=7 sin [ 7 pi t-0.4 pi x+(pi)/(3)]` . The velocity of the wave will be

A

`17.5 m//s`

B

`49 pi m//s`

C

`(40)/(2 pi) m//s`

D

`(2 pi)/(49) m//s`

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The correct Answer is:
A
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