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A Mass M2 = 1

Question 57

Multiple Choice

  A mass m<sub>2</sub> = 1.5 kg rests on a horizontal table. The coefficients of friction between m<sub>2</sub> and the table are µ<sub>s</sub> = 0.3 and µ<sub>k</sub> = 0.25. The mass m<sub>2</sub> is attached by strings to masses m<sub>1</sub> = 2.5 kg and m<sub>3</sub> = 4.5 kg as shown. Masses m<sub>1</sub> and m<sub>3</sub> hang freely. The system is initially held at rest. After it is released, the acceleration of m<sub>2</sub> is approximately A)  1.9 m/s<sup>2</sup>. B)  2.4 m/s<sup>2</sup>. C)  3.0 m/s<sup>2</sup>. D)  zero. E)  13 m/s<sup>2</sup>. A mass m2 = 1.5 kg rests on a horizontal table. The coefficients of friction between m2 and the table are µs = 0.3 and µk = 0.25. The mass m2 is attached by strings to masses m1 = 2.5 kg and m3 = 4.5 kg as shown. Masses m1 and m3 hang freely. The system is initially held at rest. After it is released, the acceleration of m2 is approximately


A) 1.9 m/s2.
B) 2.4 m/s2.
C) 3.0 m/s2.
D) zero.
E) 13 m/s2.

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