In reviewing her lab book, a physics student finds the following description of a collision: “A 4-kg air-hockey puck with an initial speed of 6 m/s to the right collided head-on with a 1-kg puck moving to the left at the same speed. After the collision, both pucks traveled to the right, the 4-kg puck at 2 m/s and the 1-kg puck at 10 m/s.” Is momentum conserved in this description? Is kinetic energy conserved in this description? Could this collision actually have taken place as described?
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