A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg)?

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F= ma31-mg = m(-2.5m/s2)31= mg-2.5 m31 = m*(9.8m/s2 -2.5 m/s2)31 = 7.3 mm = 31/7.3m = 4.25 kg

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