1. A 0.105kg hockey puck moving at 24m/s is caught and held by a 75kg goalie at rest. With what speed does the goalie slide on the ice?

1. An astronaut at rest in space fires a thruster pistol that expels 0.035kg of hot gas at 875m/s. The combined mass of the astronaut and pistol is 84kg. How fast and in what direction is the astronaut moving after firing the pistol?

1. A 0.5kg ball that is traveling at 6m/s collides head-on with a 1kg ball moving in the opposite direction at a speed of 12m/s. The 0.5kg ball bounces backward at 14m/s after the collision. Find the speed of the second ball after the collision.