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Physics
The amplitude of a wave disturbance propagating in the positive x – direction is given by at time t = 0 and by at t = 2 seconds, where x and y are in meters. The shape of the wave disturbance does not change during the propagation. The velocity of the wave is ………….
Chemistry
4 – methyl benzenesulphonic acid reacts with sodium acetate to give
Mathematics
Evaluate

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