Question

Hello, I’m just needing some help in this practice problem

Answer 1

Given

`h(t)=-16t^2+5t+15`

Set h(t) = 0

`\begin{gathered} \Rightarrow-16t^2+5t+15=0 \\ \\ \text{ Using quadratic formula } \\ \\ \Rightarrow t=(-5\pm√(5^2-4(-16)(15)))/(2(-16))=(5\pm√(985))/(32) \\ \\ \Rightarrow t=1.14\text{ sec} \end{gathered}`

Hence, the ball will hit the ground in 1.14 sec