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## Homework Statement

A rocket launched from the ground rises vertically with an acceleration of 30 m/s/s for 9.1 s until its motor stops. The acceleration of gravity is 9.8 m/s/s. Disregarding air resistance, what maximum height above the ground will the rocket achieve? Answer is units of km.

## Homework Equations

v = v(initial) + at

x = x(initial) + v(initial)t + (1/2)at^2

## The Attempt at a Solution

h = x - x(initial)

h = (1/2)(30)(9.1)^2

h = 1242 m

h = 1.242 km

I also tried it another way and got the same result. I don't see what could possibly be wrong.