Question 299546
This is the exact equation she gave me: "A child tosses a ball upward with an initial velocity of 10 f/s at a height of 3 feet. If it is not caught, how long will it be in the air?"
The formula she gave us to use is h(t)=-16^2+vt+s
I tried setting it equal to zero but got lost after that.
---------------
If you set it to zero, you can find the time when it hits the ground, when h=0.  That's how long it is in the air.
h(t)=-16^2+vt+s
Actually, it's h(t)=-16t^2+vt+s
h(t) = -16t^2 + 10t + 3
-16t^2 + 10t + 3 = 0
*[invoke solve_quadratic_equation -16,10,3]
---------------
Ignore the negative number.
t =~0.8465 seconds to impact
You were doing it right, setting it to zero.