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**1. 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.

**2. Homework Equations**

Part A:

I used the equation F_thrust_=ma-mg_earth_

Part B:

I dont' know the equation.

**3. 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.