I earlier asked a question about physics (as Mr. Squirrel). I was given a brilliant answer in a formula as my answer.
I plugged in a few things, trying to find "t".
i=0 (falling, so 0)
And the answer I got was:
t^2 = -10
What's wrong with the formula, because I checked the math w/ my teacher, my dad, etc. So it isn't me.
heh, first, what the hell kind of notation uses 'i' for velocity? Second, the general formula is like this
y = y0 + v0t + 1/2 a t^2
y0 is original position
y is final position
v0 is the velocity
a is the acceleration
t is the change in time
A positive v0 implies moving in the positive direction. A positive a implies accelerating in the positive direction. There-in lies your problem, a was negative. Things do not accelerate away from the ground (after you release them, at least).
I think it was you that I posted this to. I must have given you the wrong formula:
where t =time passed
I am sorry but I forgot to make 1/2 negative when I have it to u.