What is the rocket's initial upward acceleration?

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SUMMARY

The discussion focuses on calculating the initial upward acceleration of a 20,000 kg rocket with a thrust of 300,000 N. The correct initial acceleration is determined to be 5.2 m/s² using the equation F_thrust = ma - mg_earth. For Part B, the challenge lies in determining the mass of fuel burned when the rocket's acceleration reaches 6 m/s² at an altitude of 5 km, indicating a need for a different approach than the one used in Part A.

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Homework Statement



A 20000kg rocket has a rocket motor that generates 3E5 N of thrust.
PartA:
What is the rocket's initial upward acceleration? Express your answer using two significant figures.
Part B:
At an altitude of 5km the rocket's acceleration has increased to 6m/s^2. What mass of fuel has it burned? Use wo significant figures in your answer.

Homework Equations


Part A:
I used the equation F_thrust_=ma-mg_earth_
Part B:
I dont' know the equation.


The Attempt at a Solution


PartA: I got the right answer 5.2 m/s^2
Part B: I got it wrong i tried using the same equation as part A but didn't work.
 
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It should have worked. The thrust is constant only m has changed. What did you get?
 

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