1. The problem statement, all variables and given/known data NASA launches a shuttle with a mass (including the rockets) of 1.81 x10^6 kg. If it accelerates upward at a rate of 13 m/s2 near the Earth's surface, what is the force that the shuttle-rocket engines exert? (Of course, the shuttle does not actually have this much acceleration until it is well above the Earth's surface, but that is a harder calculation!) 2. Relevant equations F=ma 3. The attempt at a solution Is there another equation that I should use in this problem? because I was thinking that I have the mass of the entire shuttle and the acceleration at that point, so I could just plug that into the equation to solve for mass. I also tried using a free-body diagram in case I was missing anything, and then I saw that weight would play a part in this process, so then I tried F=ma-mg but I'm still having difficulty figuring out the right answer.