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Q. A spring with 49 N/m hangs vertically next to a ruler. The end of the spring is next to the 17-{rm cm} mark on the ruler. If a 2.0-{rm kg} mass is now attached to the end of spring, where will the end of the spring line up with the ruler marks?

Q. An atwood machine consists of two unequal masses connected by a cord that passes over a pulley. If m1=6.0 kg and m2=5.0 kg, what is the acceleration of masses?

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