Question

Pepe and Alfredo are resting on an offshore raft after a swim. They estimate that 3m separates a trough and an adjacent crest of surface waves on the lake. They count 14 crests that pass by the raft in 20 seconds. Calculate how fast the waves are moving.

Answer 1

wavelength=6m
freq=14/20 sec

freq*wavelengt=speed
14/20*6=84/20=4.2m/s

Answer 2

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