Free fall problem, Help!? 1. The problem statement, all variables and given/known data Hi, Im having trouble figuring out this problem: A ball is thrown directly upward with an initial velocity of 10 m/s. If the ball starts at an initial height of 2.3 m, how long is the ball in the air? Ignore air drag. 2. Relevant equations The equation that I used to solve this was: delta-y= (vi)t-1/2gt² 3. The attempt at a solution I plugged in my numbers so i got: -2.3= 10t-1/2(9.8)t² -2.3=10t-(4.9)t² 4.9t²-10t-2.3=0 then i did the pythagorean theorem(but I dont really know how to type it on the computer.. but i will try) -10 ± √((-10²)-4(4.9)(-2.3))/ 2(4.9) -10 ± √(100-45.08)/2(4.9) -10 ± √(54.92)/ 9.8 (-10 ± 7.41)/ 9.8 1.77 s or -1.77 s So I put the answer 1.77 s and it was wrong. i put 1.8s and it was wrong. I used 1.02 and it was wrong. I used 2.04 and it was wrong. I have no idea what i am doing wrong and I no longer have any more submissions for my answer (which means i oficially have a zero for that question). But i really need to know how to solve this problem! please help me! thanks!