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