The amplitude of a wave disturbance propagating in the positive x-direction is given by at time in and by `v=(1)/(1+x^(2))` at time t=0 and by `y=(1)/([1+(x-1)^(2)])` at t=2 seconds, where x and y are in metres. The shape of the wave disturbance does not change during the propagation. What is the velocity of the wave?

Answer

2