A wave and its speed

You will draw a wave of wavelength 3.0 m and frequency 4.0 Hz at two times, find its first crest each time, and work out its speed.

The idea. The crest of $y = A\sin(kx - \omega t)$ moves at the speed $v = f\lambda$. You find where the crest is with np.argmax, and then check the speed from how far it moved.

Your tasks.

1. Write wave(x, t): the displacement $0.5\sin(kx - \omega t)$ in m, using the constants given.
2. Set y0 and y1 to the rope at the times 0 and 0.04 s.
3. Set speed to the distance the first crest moved, divided by 0.04 s.