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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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.
(H 12-33)
+ v
Answer:
t =
-In
2g
V, - v
Transcribed Image Text: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. (H 12-33) + v Answer: t = -In 2g V, - v
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