The problem statement, all variables and given/known data A spacecraft moves in a circular orbit with a speed of 7.60E+0 km/s with a period of 95.1 min. What is the radius of the spacecraft's orbit? My answer, which is correct, is 6.90×106 m What is the radial acceleration of the satellite? 8.37 m/s^2 was my answer, and it is correct. My issue begins right here: In order to begin its re-entry, the spacecraft engines are fired to provide an acceleration of 6.70 m/s2 in a direction opposite to its velocity. What is the magnitude of the spacecraft's total acceleration just after the engines begin to fire. The attempt at a solution The only thing I really grasp from this last question is that it starts going in the opposite direction, meaning you have to overcome the velocity it is originally going in to go the other way. Otherwise, I don't know where to start.