# Physics

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A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 5.2 seconds later. If the speed of sound is 340 m/s, how high is the cliff?

• Physics -

distance = rate * time
height = 5.2 * 340 = 1768m

It should be as simple as that.

• Physics -

Michael, the time given is not the time for the sound traveling. See my post

• Physics -

The time given is the time of falling and the time of thesound going up.
time sound= h*340
time falling
h= 1/2 g timefalling or
time falling= 2h/g=5.2-h*340 solve for h

• Physics -

Bob - is "g" in your equation gravity?

• Physics -

Oh, sorry. I didn't mean to give wrong information.

• Physics -

g is the acceleration due to gravity, yes.

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