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I earlier asked a question about physics (as Mr. Squirrel). I was given a brilliant answer in a formula as my answer.
1/2t^2+i*t+h=c
t=time passed
i=initial velocity
h=initial height
c=current height
I plugged in a few things, trying to find "t".
t=?
i=0 (falling, so 0)
h=10m
c=5m
And the answer I got was:
t^2 = -10
THAT'S IMPOSSIBLE!
What's wrong with the formula, because I checked the math w/ my teacher, my dad, etc. So it isn't me.
Any ideas?
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:
y=-1/2t^2+vt+i
where t =time passed
v=initial velocity
i=initial height
y=current height
I am sorry but I forgot to make 1/2 negative when I have it to u.