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Yes. Acceleration can be positive or negative. When he jumps out of the airplane and is in free fall, he is accelerating in a downward direction, so his acceleration is negative. When he opens his parachute, he accelerates in an upward direction, so his acceleration is positive.

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βˆ™ 2012-08-20 16:56:11
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Q: Can a man in a parachute accelerate?
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