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April 17, 2014

Homework Help: College Physics

Posted by Anon14 on Sunday, September 11, 2011 at 10:58pm.

Two children are playing on a 178.2 m ­tall bridge. One child drops a rock (initial velocity zero) at t = 0 . The other waits 2.7 s and then throws a rock downward with an initial speed v0. If the two rocks hit the ground at the same time, what is v0 ?

for the first rock i used:
t(ground)=square root((2yo)/g)
... then I subtracted 2.7s from that number

I think you use Vo=(y-0)+.5gt^2/t
...I am not getting the correct answer. Any advice?

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