This picture doesn't actually show a wave very well... but let's just pretend. The 'wave' in the picture, appears to be moving towards the shore. This isn't technically true, since it's only the wave energy that's moving, while the water is just the medium that the energy is moving through. It's a transverse wave, because the energy is moving perpendicular to the velocity of the wave. Throughout the duration of this wave, the velocity should stay constant, even if the amplitude or wavelength changes.
The principle of superposition states that two different waves can occupy the same space and time. This means that when two waves collide, they actually go through each other instead of bouncing back, the way the carts did when we did the air track labs.
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