A pair of wave pulses moves towards one another along a long rope. Each pulse has the same amplitude and wavelength, and both travel at a speed of $0.50\,\text{m s}^{-1}$. The diagram indicates the rope at time $t = 0$. Which diagram represents the rope at time $t = 3.0\,\text{s}$?
Physics 9702 · AS & A Level · Progressive waves