A Projectile Is Launched Straight Up from the Ground with an Initial

Short Answer

A projectile is launched straight up from the ground with an initial velocity of $320 \frac{\mathrm{ft}}{\mathrm{sec}}$ . At what time(s) will the projectile be at least 1,584 feet above the ground? Directions: Show all work where appropriate. A graphing calculator may be necessary to answer
some questions.