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# Can someone explain the answers to this question?

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1. https://gyazo.com/f1e5e334695fdb5a04b926a05b94b1d0 - The question

https://gyazo.com/a024a44ea9fe63540c19312579ae1d3e - The mark scheme

From January 2009 Edexcel Physics

a) The only part I understand.

b) how is the wave moving downwards when all that is provided is amplitude which is 0 at that point?

c)how is it at rest when the amplitude is maximum?
2. (Original post by brbrbrh)
https://gyazo.com/f1e5e334695fdb5a04b926a05b94b1d0 - The question

https://gyazo.com/a024a44ea9fe63540c19312579ae1d3e - The mark scheme

From January 2009 Edexcel Physics

a) The only part I understand.

b) how is the wave moving downwards when all that is provided is amplitude which is 0 at that point?

c)how is it at rest when the amplitude is maximum?
You seem to be confusing displacement, amplitude and velocity.

Amplitude is the maximum displacement.

Velocity is the rate of change of displacement.

For b), imagine the wave moving. The question tells you that it is moving to the right. Which way is the water moving vertically?

For c), speed is related to the magnitude of the gradient. If the speed is 0, the gradient is 0. This is the same as SHM.

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