Explain why this statement is incorrect: “If I find something on the Internet, that means it is for public use, and I can do any
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The wavelength 
of the wave is 160 m, and this is the distance between two consecutive crests. The boat is located at a crest of the wave, this means that the first trough is located 80 meters from the boat (because the distance between a crest and a trough is half the wavelength).
The speed of the wave is
so the time the boat takes to reach the first trough is
The speed of the wave is
so the time the boat takes to reach the first trough is
Let say the height of two balls from the ground is H
now we can use kinematics
now we have
now in the same time ball on the left will cover the horizontal distance between them
<em>so above is the horizontal speed of the left ball</em>