Tuesday
September 30, 2014

Homework Help: physics

Posted by Lya on Thursday, May 29, 2014 at 11:31pm.

A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.2 s later. If the speed of sound is 340 m/s, how high is the cliff?
vo= 0; s=340 m/s; t= 3.2s
h=?

t1+t2= 3.2 s
t2= 3.2-t1

I used Eq: h= vo*t^1+1/2at^2

rearranged eq.
h= (4.9)(t)^2
t^2= h/4.9

t^2= 340/4.9= 69.38 s
substitute--> 69.38=3.2-t^1
t^1= -66.18 s

Sorry, I don't know if I am doing this right.I still can't figure out how to get h=?

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