SOLUTION: JP launches a rocket straight upwards from a height of 20 feet above the ground with an initial upward velocity of 85 feet per second. The equation h(t) = -16tē + 85t + 20 models t

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: JP launches a rocket straight upwards from a height of 20 feet above the ground with an initial upward velocity of 85 feet per second. The equation h(t) = -16tē + 85t + 20 models t      Log On


   

Question 1073263: JP launches a rocket straight upwards from a height of 20 feet above the ground with an initial upward velocity of 85 feet per second. The equation h(t) = -16tē + 85t + 20 models the height of the rocket off of the ground, t seconds after the rocket is launched.

a) Find the height of the rocket 3 seconds after it is launched.
b) At what time will the rocket reach the maximum height? What is the maximum height of the rocket?
c) When will the rocket reach a height of 100 feet?
d) At what time will the rocket hit the ground?
Answer by Alan3354(69443) About Me  (Show Source):