If a wave travels 50 meters south in 3 seconds, what is the velocity of the wave?

v = d / t = (50 m) / (25 s) = 2 m/s.

Explanation:

If the crest of an ocean wave moves a distance of 20 meters in 10 seconds, then the speed of the ocean wave is 2.0 m/s. On the other hand, if the crest of an ocean wave moves a distance of 25 meters in 10 seconds (the same amount of time), then the speed of this ocean wave is 2.5 m/s. The faster wave travels a greater distance in the same amount of time. so the answer is 5.0 m/s