The international space station has a mass of 1.8 × 105 kg. a 70.0-kg astronaut inside the station pushes off one wall of the station so she accelerates at 1.50 m/s2. what is the magnitude of the acceleration of the space station as the astronaut is pushing off the wall? give your answer relative to an observer who is space walking and therefore does not accelerate with the space station due to the push.