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A 20,000kg rocket has a rocket motor that generates [tex]3.0 *10^5N[/tex] of thrust.

1. What is the rocket's initial upward acceleration?

I used the formula F=MA and got 15 but apparently thats not the right answer. So Im stumped.

2. At an altitude of 5000m the rocket's acceleration has increased to 6.0m/s^2. What mass of fuel has it burned?

Im assuming I need the answer to the first part and that the 5000m is irrelevant.

[tex]300000=m_1*6[/tex] Then I should be able to get the answer [tex]20000-m_1[/tex]

Thanks.