For an elastic rope placed horizontally, the right end o vibrates in the vertical direction with a period of 0.4s. If t = 0, the right end starts to vibrate upward. Please draw the waveform on the rope when t = 0.5s

The period of the wave is t = 0.4s. After t = 0.5s, 54 wavelengths of waveforms are formed. The waveforms are drawn as shown in the figure

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