Question

quadratic formula.

Answer 1

Hint: Think of a ball being thrown into the air...what would bring it back down?

Answer 2

lol idk thats hy ii asked

Answer 3

...well what would bring it back down is gravity right?

Answer 4

Hi, I'm pretty new to this site and I don't know if it's frowned upon to do this, but I went ahead and solved it for you.
So we basically set the equation up as the kinematic equation and recognize that it's a quadratic, thus, we use the quadratic equation (You may already know this). Normally we're given 2 answers for our this, so we toss away the negative value and should use the positive solution.
To check if the solution works, we plug the solution back into the original equation.

Note: I'm sorry if this may be over kill on information. As mentioned before, I'm pretty new here and this is my first post.