y (cm) A wave travels (at speed v) across the x axis. The top graph represents the displacement (y) vs. position (x) @ t=0. The bottom graph represents the displacement (y) vs. the time @ the point x = 0. What is the speed of the wave (v)? Is it going in the +x or - x direction? y (cm) L -1 0 1 2 3 4 5 6 7 x (m) -1 0.00 0.25 0.50 0.75 1.00 1.25 t(s)