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Mathematics
Problem
A particle moving for
t
≥
0
t\ge 0
t
≥
0
has velocity
v
(
t
)
=
3
e
−
t
−
1
v(t)=3e^{-t}-1
v
(
t
)
=
3
e
−
t
−
1
. Determine the time, if any, at which the particle changes direction.
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