AP Physics C Mechanics Quiz
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KINEMATICS
Question 1
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A particle moves in the xy-plane with a position vector given by
r
⃗
(
t
)
=
(
2
t
3
−
3
t
)
i
^
+
(
t
2
+
1
)
j
^
\vec{r}(t) = (2t^3 - 3t)\hat{i} + (t^2 + 1)\hat{j}
r
(
t
)
=
(
2
t
3
−
3
t
)
i
^
+
(
t
2
+
1
)
j
^
. What is the magnitude of the particle's velocity at
t
=
2
s
t=2 \text{ s}
t
=
2
s
?
A
21
\sqrt{21}
21
B
457
\sqrt{457}
457
C
25
25
25
D
461
\sqrt{461}
461
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