## Time for a wave to propagate

1. The problem statement, all variables and given/known data
Show that the time it takes a wave to propagate up the cable (cable which hangs vertically under its own weight) is t = 2$$\sqrt{L/g}$$, where L is the cable length.

2. Relevant equations
i think.... v=$$\sqrt{F/\mu}$$

3. 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??

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 Quote by pcjang 2. Relevant equations i think.... v=$$\sqrt{F/\mu}$$
Yes. And F is the tension in the cable.