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## Homework Statement

Show that the time it takes a wave to propagate up the cable (cable which hangs vertically under its own weight) is t = 2[tex]\sqrt{L/g}[/tex], where L is the cable length.

## Homework Equations

i think.... v=[tex]\sqrt{F/\mu}[/tex]

## The Attempt at a Solution

i've been staring at this problem for about 2 hours now. can anyone just help me how to get started on this one??