Chapter 5.6, Problem 39E

(a)

To determine

The time taken by an object to reach the height 64 ft. at a speed of $32\text{ ft per sec}\text{.}$ where the quadratic equationfor height is $h=-16t^2+32t+48$. Her, $h$ represents the height in feet and $t$ represents the time in second.

(b)

To determine

The time taken by an object to reach the height 60 ft. with the help of quadratic equation $h=-16t^2+32t+48$. Where, $h$ is the height in feet and $t$ is the time in second.

(c)

To determine

The time taken byan object when an object hit the ground. The quadratic equation is $h=-16t^2+32t+48$. Where, $h$ is the height in feet and $t$ is the time in second.

(d)

To determine

The reason behind this the quadratic equation in part (c) which has two solutions, only one of them is appropriate.