A Federation starship ( 1.80×10^6 kg) uses its tractor beam to pull a shuttlecraft ( 2.10×10^4 kg) aboard from a distance of 15.0 km away. The tractor beam exerts a constant force of 4.0 X 10^4N on the shuttlecraft. Both spacecraft are initially at rest. How far does the starship move as it pulls the shuttlecraft aboard?