Chapter 5.7, Problem 41ES

Assume that a free-fall model applies. Solve these exercises by applying Formulas $\left(15\right)$ and $\left(16\right)$ . In these exercises take $g=32{\text{ ft/s}}^{\text{2}}$ or $g=9.8{\text{ m/s}}^{\text{2}}$ , depending on the units.

A projectile is fired vertically upward from ground level with an initial velocity of $16\text{ ft/s}$ .

(a) How long will it take for the projectile to hit the ground?

(b) How long will the projectile be moving upward?