An object is thrown vertically upward such that it has a speed of 21 m/s when it reaches two thirds of its maximum height above the launch point. Determine this maximum height.(adsbygoogle = window.adsbygoogle || []).push({});

I can't figure what to do since initial velocity isn't given and I don't see a way to solve for it.

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# Homework Help: Test tomorrow, can't figure this problem out

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