A flea jmps to a maximum height of 0.390m. Find vi as it leaves the ground.(adsbygoogle = window.adsbygoogle || []).push({});

I thought of using the equation vf^2 = vi^2 + 2ad

but in this case, if i wanna find out vi, I get

-vi^2 = 2ad.

and because of the negative, it doesn't work...

How do you solve this problem??

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# Homework Help: Kinematics question

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