The amplitude of wave disturbance propagating in the positive x – direction is given by $\mathrm{y}=\frac{1}{(1+\mathrm{x}{)}^2}$ at time t = 0 and $\mathrm{y}=\frac{1}{1+(\mathrm{x}-2{)}^2}$ at t =1s, where x and y are in metre. The shape of wave does not change during the propagation. The velocity of the wave will be….m/s