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Question: 12 27 when a particle falls through the air its...

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12 27. When a particle falls through the air, its initial acceleration a = g diminishes until it is zero, and there- after it falls at a constant or terminal velocity vf. If this variation of the acceleration can be expressed as a = (g/ ) (U2f-v2), determine the time needed for the velocity to become v vf/2. Initially the particle falls from rest. (vE v2), determine the time needed for the
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