# Point in water wave with greatest upwards speed?

## Homework Statement ## The Attempt at a Solution

I chose D because I thought that since it is at the lowest point on the wave, it will move upwards with the greatest speed. But I'm wrong, since the answer is C. Is the answer C because of some time of acceleration from point D to C? If so, then why is the answer not B instead?

Or the water waves here can be compared to the swinging pendulum, where velocity is greatest at its equilibrium position. I have no trouble understanding the pendulum case but I can't picture the velocity of the water waves at their different positions.

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Orodruin
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Homework Helper
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The situation is exactly analogous to the pendulum. At B the water surface is rising the fastest (assuming that the entire wave moves with the given speed). If it helps, you can try drawing the position of the wave just a small time later and see how the surface has moved.

The situation is exactly analogous to the pendulum. At B the water surface is rising the fastest (assuming that the entire wave moves with the given speed). If it helps, you can try drawing the position of the wave just a small time later and see how the surface has moved.
Errm, so you mean that the speed of water wave is fastest at B, not C?

Orodruin
Staff Emeritus