Looking at the pole at the end of the pier. john counted 20 waves in 10 seconds. he also estimated that wavelength was 4 meters. what was the approximate wave speed?

8 meters per second

Step-by-step explanation:

Hi, to answer this, first, we have to divide the time counted by the number of waves, to obtain the time of each wave:

10 /20 = 0.5 seconds per wave

Now, we simply divide the distance given by the time, to obtain the speed rate:

4/0.5 = 8 meters per second

Feel free to ask for more if needed or if you did not understand something.