CPM Homework Help : CALC Problem 6-48

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?

Hint (a):

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

Hint (a):

What do the zeros of s(t) represent?

Hint (b):

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