1. The problem statement, all variables and given/known data Ok, so i'm having alot of trouble finding time when it is not given in a projectile motion problem. Here's what I have set up: X A=O Vi=100.0 VF=100.0 D=? T=? Y A=-9.8 Vi=O Vf=? D=8848m T=? 2. Relevant equations Distance(d=1/2at2=vit) 3. The attempt at a solution Ok, here's where my problem is, I can never get the time right. I have failed 2 tests and numerous homework assigments because something is wrong. Here's my attempt at it: 8848=1/2(-9.8)t2 I divide both sides by 8848 then square root it. I ALWAYS get the wrong time and in turn that gives me the wrong distance and in turn I fail the test.