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The displacement function of a wave travelling along positive x-direction is y = 1/(2 + 3x^2) at t = 0

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The displacement function of a wave travelling along positive x-direction is y = 1/(2 + 3x2) at t = 0 and by y = 1/(2 + 3(x - 2)2) at t = 2 s , where y and x are in metre. The velocity of the wave is 

(a) 2 m/s

(b) 0.5 m/s

(c) 1 m/s

(d) 3 m/s

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Correct option (c) 1 m/s

Explanation :

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