- #1

nakita22

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## Homework Statement

A model rocket blasts off and moves upward with an acceleration of 12 m/s^2 until it reaches a height of 26 m, at which point the engine shuts off and it continues its flight in free fall. A)what is the maximum height attained by the rocket? B) What is the speed of the rocket just before it hits the ground? C) What is the total duration of the rocket's flight?

## Homework Equations

In the Example that is somewhat like this question in the book is using the equation:

Xf= Xi + Vi(t) - 0.5(g)t^2 = 0,

but this makes absolutely no sense since the intial acceleration is given as 12 m/s^2

## The Attempt at a Solution

I have attemped this question and several others in different ways and I just can not find a equation that I can manipulate so it fits into a free fall situation. Do I just assume the 12 m/s^2 for the first 26 m and then from there incorporate the acceleration of gravity 9.81 m/s^2 is it coming straight back down or is it forming a parabola? It is just way too confusing, and 4 hours at this problem is just way too much. Any help or suggestions would be greatly appreciated!