Wave crests are passing the anchor chain of an anchored boat every 5 seconds. If the wave troughs are 15 m apart, what is the speed of the waves?

Answer 1

Let

T = 5s be the period of the wave,

λ = 15m be the wave length,

v (to be calculated) be the speed.

The relationship among those three quantities is

v = λ/T

Substituting actual numbers

v = 15/5 = 3 m/s