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Q. A boy sitting in a rail road car throws a ball straight up into the air. The ball will fall back into his hands when the rail road car is

  • (A) moving at constant velocity
  • (B) accelerating forward while going around a curve of radius equal to the maximum height attained by the ball
  • (C) accelerating forwardA block A is dropped down a smooth inclined plane, while another identical block B is released for free fall from the same height
  • (D) decelerating

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