Question 43206
It depends, are you throwing the ball of a 10-foot building or are you throwing the ball onto the ground where you are 10 feet high.
If you are throwing the ball off a 10-foot building (which is likely the case):
We want the height to be zero.
{{{h = 0}}}
{{{h = -16t^2 + 30t + 10}}}
{{{0 = -16t^2 + 30t + 10}}}
*[invoke quadratic "t", -16, 30, 10]
About: 2.16 seconds