A ball is thrown upward from a height of 15 ft with an initial upward velocity of 5 ft/s. Use the formula h=-16t^2+vt+s to find how long it will take for the ball to hit the ground?

Question

Use the quadratic formula to solve each equation.

Answer 1

h(t) = -16t² + 5t + 15

Set h(t)=0 and solve for t using the quadratic formula. You will get a negative and a positive solution. Since t starts at t=0, the positive solution is the correct one.