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Q. A coffee filter of mass 1.1 grams dropped from a height of 1 m reaches the ground with a speed of 0.5 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, the Earth, and the air.

Q. A railroad freight car weighing 282 kN and traveling at 1.51 m/s overtakes one weighing 211 kN and traveling at 0.914 m/s in the same direction. The cars couple together. Find the speed of the cars after collision.

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