4 A fisherman notices that wave
crests pass the front of his boat
every 6.00 s. He measures the
distance between two crests to be
15.0 m. How fast are the waves
travelling?
(Unit = m/s)

Speed of wave = 2.5 m/s

Explanation:

Given:

Time taken by wave = 6 second

Height (Distance) of wave = 15 meter

Find:

Speed of wave

Computation:

⇒ Speed = Distance / Time taken

⇒ Speed of wave = Height (Distance) of wave / Time taken by wave

⇒ Speed of wave = 15 / 6

Speed of wave = 2.5 m/s

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.