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Physics
Physics
Problem
The position vector of a particle changes with time according to the relation
r
⃗
(
t
)
=
15
t
2
i
^
+
(
4
−
20
t
2
)
j
^
\vec{r}(t) = 15t^2\hat{i} + (4 - 20t^2)\hat{j}
r
(
t
)
=
15
t
2
i
^
+
(
4
−
20
t
2
)
j
^
. What is the magnitude of the acceleration at
t
=
1
t = 1
t
=
1
? a. 40 b. 25 c. 100 d. 50
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