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mstud
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Homework Statement
A rocket is fired vertically and contiues for 1 minute with the acceleration 20 m/s^2. Then it has used up all the fuel , and the rocket continues in free fall.
a) How high does the rocket come?
Homework Equations
[tex]s(displacement)=v_0t + \frac 12 at^2[/tex]
The Attempt at a Solution
I can also assume that the initial speed v0 is = 0 m/s, right?
This gives s= 0*60s + 1/2 * 20 m/s^2 * (60s)^2 = 36000 m =3.6*10^5 m.
However, the answer key of my book says s=1.5*10^5m.
Can you find something wrong in what I have done or is my book wrong?
Please help!