### Home > CALC > Chapter 7 > Lesson 7.2.3 > Problem7-91

7-91.

Feng throws a baseball directly up in the air with an initial velocity of $16$ feet per second from a height of $4$ feet.

1. When will the ball hit the ground?

Acceleration due to gravity $= −32$ ft/sec$^2$

2. What is the ball's maximum height?

Optimize. Or use Algebra to find the vertex of the parabolic position function.

3. What is the ball's velocity when it hit the ground?

First figure out WHEN it hits the ground.

4. What is the total distance the ball traveled from $t = 0$ sec to $t = 0.75$ sec.

Do not confuse total distance with displacement.