A travelling harmonic wave on a string is described by y(x,t) = 7.5sin(0.0050x + 12t + π/4) (a) what are the displacement and velocity of oscillation of a point at x = 1cm, and t = 1s ? Is this velocity equal to the velocity of wave propagation ? (b) Locate the point of the string which have the same transverse displacement and velocity as x=1cm point at t=2s,5s and 11s.