- #1
Kennyh
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Homework Statement
A model rocket is launched straight upward with an initial speed of 46.7 m/s. It accelerates with a constant upward acceleration of 2.16 m/s2 until its engines stop at an altitude of 138 m.
What is the maximum height reached by the rocket?
How long after lift off does the rocket reach its maximum height?
How long is the rocket in the air?
Homework Equations
What I found out from the given information above is that xi=o,xf=138m,vi=0m/s,vf=?,a= 2.16m/s2, and t= is ?.
I used this equation = vf^2=2a(xf-xi)+vi^2 to find Vf and vf was 52.7 m/s. from this point on I do not know how to find the maximum height or the other two question? Please help thank you very much