A standing wave is represented by, y-Asi...

A standing wave is represented by, `y-Asin(100t)cos(0.01x)`, where x,y and A are in millimeter and t in second. The velocity of the wave is

A

`10^4 m//s`

B

not derivable

C

`1 m//s`

D

`10^2 m/s`

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