(b) Adapting Eq. 211, the velocity of the particle is given by
G
G
G
vv a
t
=+
0
.
Thus, at
t
= 3.8 s, the velocity is
()
22
ˆˆ
ˆ
ˆ
ˆ
(8.0 m/s) j
(4.0 m/s )i
(2.0 m/s ) j 3.8 s
(15.2 m/s)i
(15.6 m/s) j
v
+
=
+
G
which has a magnitude of
2
2
(15.2 m/s)
(15.6 m/s)
22 m/s.
xy
vv
v
=
+
=
111. Since the
x
and
y
components of the acceleration are constants, we can use Table 21
for the motion along both axes. This can be handled individually (for
Δ
x
and
Δ
y
) or
together with the unitvector notation (for
Δ
r
). Where units are not shown, SI units are to
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 Spring '08
 Any
 Physics, Acceleration

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