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The equation of vibration of a 60 cm lon...

The equation of vibration of a 60 cm long string string stretched at both ends is given by ` y = 4 "sin" (pi x)/(15) "cos" 96 pi t` .
Here x and y are expressed in cm and t in s .
What is the velocity of the particle at the position x = 7 . 5 cm , at time t = 0 . 25 s ?

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