[Potironette]

Thank-you for explaining! I hadn't realized I was given all the stuff needed to find average velocity :o

Just [ s u b ][/ s u b] and [s u p][/ s u p] xD? (I forgot this existed, and I was lazy)

Also, one more question: for something that uses x_f = x_i + v_it + (1/2)at², if I just try to solve for t I get two answers. Usually one's negative and one's positive, but sometimes both are positive and in either case I don't know what they mean.

(More specifically, I have a problem that says: A boulder takes 1.30 s to fall the last 1/3 of the way down a cliff, and I have to (a)find the height of the cliff and (b)explain what the two solutions to a quadratic meant if I got two solutions and used a quadratic equation.

Along the way, I suppose I had to find the time too. (I didn't figure out how to do the problem myself so I basically looked at the solution and tried to understand it T_T)

Using x_f = x_i + v_it + (1/2)at², I get that
h = (1/2)gt²
(2/3)h = (1/2)g(t-1.30s)² --> h = (3/4)g(t-1.30s)²
(1/2)gt² = (3/4)g(t-1.30s)²

t² = (3/2)(t-1.30s)²
t = .716 s or t = 7.08 s

If I square rooted that above equation, the t = .716 s would disappear, but otherwise I would only know that t must be 7.08 s because .716 s is too short. But what does .716 s mean?)