问题补充：
See the picture of the wave at some time,and we know that the direction of velocity is rightvelocity of the wave V=5m/s,Find:（1）、How much swing(振幅) of the wave is?（2）、 How much wavelength of the wave
答案：
1.Swing is 2m
2.Wavelength is 8m
3.frequency is 5/8 period is 8/5
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