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ganoobinator

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**Rocket Project -- need to find mass of rocket to reach 15 m altitude**

I have a project for grade 11 physics, i have to create a rocket that reaches precisely 15 m altitude, and all I am given is the thrust profile of the engine (force(N) vs time(s) graph)

It is an Estes A8-5 engine

i have used calculus to integrate and find the impulse, which is 2.50N*s, total burn time is 0.7s

im stuck, i can't find the mass without the acceleration, i can't find the acceleration without the final velocity after burn.

ive tried everything i can think of, even energy problems, can't seem to figure it out.