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May 24, 2015

Homework Help: Physics

Posted by Anonymous on Friday, December 7, 2012 at 6:08pm.

You shoot a rocket straight into the air from the ground.It takes 8.0 seconds to come back down to the ground.What was its initial velocity ?

Vf^2=Vi^2+2ax
0=vi^2+2(-9.8)(8.0) <----- My work
vi^2=-156.8

I don't how to solve the last step

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