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. An astronaut initially at rest in space fires a thruster pistol that expels 35 grams of hot gas at 875 m/s in front of her. If the astronaut has a total mass of 160 kg while wearing her spacesuit,...

Rob has a mass of 75 kg and stands on a frozen lake at rest. Suddenly, Rob’s 45-pound dog comes running across the ice at 4.6 m/s and collides with Rob. How fast does Rob and his dog move together...

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