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Mathematics
Mathematics
Problem
The velocity of a particle is
v
(
t
)
=
⟨
t
2
,
t
⟩
\mathbf v(t)=\langle t^{2},\, t\rangle
v
(
t
)
=
⟨
t
2
,
t
⟩
for
−
1
≤
t
≤
2
-1\le t\le 2
−
1
≤
t
≤
2
. At which of the following times is the particle’s speed decreasing? a)
t
=
1
t=1
t
=
1
b)
t
=
−
1
t=-1
t
=
−
1
c)
t
=
0
t=0
t
=
0
d)
t
=
2
t=2
t
=
2
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