Question #6c732
1 Answer
Sorry, what's the question here? 6 seconds, if you're looking for the time it takes for the rock to hit the ground.
Explanation:
It's not super clear what you're asking (no offence).
If you're asking how long it takes the rock to hit the ground (just my guess) I can answer that.
We know the height is given as
though I feel like the "x"s were supposed to be "t"s, since h was a function of t and you didn't mention t in the equation. To rewrite,
We also know that when the rock hits the ground,
So we need to solve the quadratic for when
We can divide by 16
Now we can factor this or use the quadratic formula . Just for fun, let's use the quadratic formula. I'm assuming you know how to solve quadratics, but if not perhaps check out the links above.
But the negative 5 doesn't really make sense in this case (the equation doesn't apply for t less than 0), so let's take the value of 6.
So, after 6 seconds, the rock will hit the ground.