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Q1. A 1.40kg brick is sliding along on a rough horizontal surface at 10.0 m/s, if the brick stops in 4.40 s, how much mechanical energy is lost?

Q2. Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Overlook any effects that might be caused by interstellar dust and gas.)

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