### Home > CALC3RD > Chapter Ch7 > Lesson 7.3.2 > Problem7-122

7-122.

​ 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 $\text{gravity }= −32 \text{ ft}/\text{sec}^2$

2. What is the ball’s maximum height?

Optimize.Or use algebra to locate the vertex of the parabolic position function.

3. What is the ball’s velocity when it hits the ground?

First figure out WHEN the ball hits the ground.

4. What is the total distance the ball travels from $t = 0$ seconds to $t = 0.75$ seconds?

Do not confuse total distance with displacement.