4. When a particle falls through the air, its initial acceleration a = g diminishes until it is zero, and thereafter it falls at a constant velocity vf . If this variation of the acceleration can be expressed as g(v} -v²) a = determine the time needed for the velocity to become v < vf. Initially the particle falls from rest. (Н 12-33) v, +v In 2g Answer: t = v, -v
4. When a particle falls through the air, its initial acceleration a = g diminishes until it is zero, and thereafter it falls at a constant velocity vf . If this variation of the acceleration can be expressed as g(v} -v²) a = determine the time needed for the velocity to become v < vf. Initially the particle falls from rest. (Н 12-33) v, +v In 2g Answer: t = v, -v
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