Question

19. For livesh's Model A rocket, he uses the equation h=-490^2+ 1120t. When is the height of the Model A rocket 640 centimeters?

Answer 1

t = 1.143 s

Explanation:

The equation he uses to model the height of the rocket in cm, as function of time is

h(t) = -490 t^2 + 1120t

We can plot this equation using a graphing tool

Please, see attached picture

The rocket reaches his maximum height (640 cm) at

t = 1.143 s