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Physics
Physics
Problem
A particle moves such that
v
(
t
)
=
⟨
30
,
40
−
10
t
⟩
\mathbf{v}(t)=\langle 30,40-10 t\rangle
v
(
t
)
=
⟨
30
,
40
−
10
t
⟩
. Find all times within
0
≤
t
≤
8
0 \leq t \leq 8
0
≤
t
≤
8
when the direction angle of velocity with the
+
x
+x
+
x
-axis is
45
∘
45^{\circ}
4
5
∘
in the first quadrant.
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