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sin all problems 2.) A small sphere hangs from a string attached to the ceiling of a uniformly accelerating train car. It is observed that the string makes an angle of 37 with respect to the vertical. The magnitude of the acceleration a of the train car is most nearly (A) 60 m/s (B) 7.5 m/s (C) 8.0 m/s (D) 10 m/s (E) 13 m/s
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