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## Homework Statement

Two buoys are floating in the sea, separated by 5 m. A wave with a wavelength of 15 m travels from left to right along the line between the buoys. The left-most buoy moves vertically up and down as described by the equation y=Acos(ωt). Which equation best describes the motion of the buoy on the right?

a) y = A cos (wt-pie/2)

b)y = A cos (wt + 90deg)

c) y = A cos (wt - 2pie/3)

d) y = A cos (wt- pie/4)

e) y = A cos (wt + pie/4)

## Homework Equations

## The Attempt at a Solution

I got my answer as C which is correct but I just guessed by finding the wavenumber and timsing it by 5.. i dont understand what x is in the cosine function for wave form exactly and i dont know how to solve this properly! cheers