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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

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