### Home > CALC > Chapter 6 > Lesson 6.1.4 > Problem6-48

6-48.
1. On the moon, the acceleration due to gravity is about −5 ft/sec2. An astronaut jumps into the air with an initial upward velocity of 12 ft/sec. Homework Help ✎

1. How long is the astronaut off the ground?

2. How far off the ground does the astronaut rise?

$s(t)=\frac{1}{2}at^{2}+v_{0}t+s_{0}$

What do the zeros of s(t) represent?

Find the y-value of the vertex of s(t). You can use Algebra or Calculus.