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Q. A mass of 210 oscillates on a horizontal frictionless surface at a frequency of 3.6 and with amplitude of 5.0 . How much energy is involved in this motion?

Q. Two people are holding up the ends of a 4.75-kg wooden board that is l = 2.00 m long. A m = 3.00-kg box sits on the board, 0.50 m from one end. What forces do the two people exert?

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