A couple of questions in this problem. 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.