Posted by **anthony** on Friday, October 1, 2010 at 5:11pm.

eng physics a rock is dropped at sea cliff at the sound of it striking the ocean if head 3.4 seconds later. If the speed of sound is 340m/s how high is the cliff?

- college physics -
**bobpursley**, Friday, October 1, 2010 at 5:20pm
3.4 seconds= time for rock to fall+time for sound to come up.

falling: h=1/2 gt^2, or t= sqrt2h/g

sound: h=vsound*t or t=h/speedsound

3.4=sqrt 2h/g + h/speedsound

looks like a quadratic equation to me.

let u^2=h

u^2/speedsound+u sqrt2/g - 3.4=0

solve for u, then go back and solve for h.

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