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## Homework Statement

A stone is dropped off a cliff of height h. At the same time, a second stone is throne straight upward from the base of a cliff with an initial velocity v. Assuming that the second rock is thrown hard enough at what time t will the two stones meet.

## Homework Equations

Uniform acceleration equations

## The Attempt at a Solution

I tried a few different things, and nothing worked. I don't have anything written down right now though.

I just wrote Δd = v

_{1}Δt + 1/2gΔt

^{2}, for both stones, substituting Δd for x in one of the equations, and h - x in the other.

So, I just had x = 1/2gΔt

^{2}and h - x = v

_{1}Δt + 1/2gΔt

^{2}

I tried combining them, but I got to a point where I didn't think I could do anything else with it, and it just felt wrong.

Am I thinking about it wrong?

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