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January 30, 2015

January 30, 2015

Posted by **Sierra** on Wednesday, June 20, 2012 at 10:10pm.

t = 0.

The other waits 1.1 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

- Physics -
**Elena**, Thursday, June 21, 2012 at 4:33amThe time of the first rock fall is

t1=sqrt(2h/g)=sqrt(2•154/9.8) =5.6 s.

The time of the second rock motion øs

t2=t1-1.1 =5.6-1.1=4.5 s.

h=vₒt+gt²/2.

vₒ=(h- gt²/2)/t= h/t-gt/2=154/4.5 -9.8•4.5/2 =34.22-22.05=12.17 m/s

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