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A 20,000 kg rocket has a rocket motor that generates 3.0*10^5 N of thrust. At an altitude of 5000 m the rocket's acceleration has increased to 6.0 m/s^2. What mass of fuel has it burned?

I've already found the initial acceleration to be 5.2 m/s^2, then I used this formula:

(Fthrust) - (Mnew)(g) = (Mnew)(a)

To solve for m, I think I got the wrong algebraic process wrong -

m = (Fthrust)/(g+a)

because my answer isn't right!

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# Fuel burned by a rocket

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