1. The problem statement, all variables and given/known data All I need to do is figure out at what height h above the ground does a projectile have .5v using only v and g in the answer. 2. Relevant equations Conservation of energy: KEi=GPEf .5mv2=mgh 3. The attempt at a solution so I went ahead and just plugged in .5v or v and solved for h so... .5(.5v)2=gh .5(.25v2)=gh .125v2=gh h=v2/8g however, the correct answer is 3v2/8g so I guess all I need to know is where the 3 came from. I don't see any algebraic errors and I frankly don't have any other ideas Any help is greatly appreciated, Thanks!