Why isn't the amplitude at x = 6 cm equal to zero?

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chukie
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For the wave shown in this drawing, what is the amplitude at x = 6 cm?
[Hint: Remember that the wave will be moving. So even though there presently is an node at x = 6 cm, this will change at a later time.]


I put 0 cm as the answer but I got it wrong and I don't understand why it's not zero. Could someone please help me?
 

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I think you need to understand the difference between the amplitude and the instantaneous displacement of the particle.