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The vibration of a string of length 60cm...

The vibration of a string of length 60cm fixed at both ends are represented by displacedment `y=4sin ((pix)/(15)) cos (96pi) where x and y are in cm and t in second. The particle velocity at `x=22.5 and t=0.25` is

A

zero

B

`4 xx 96cm s^(-1)`

C

`100 cm s^(-1)`

D

`96cm s^(-1)`

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The correct Answer is:
A
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