Solución
v
(
t
)
=
−
2
s
e
n
t
j
+
3
c
o
s
t
k
,
a
(
t
)
=
−
2
c
o
s
t
j
−
3
s
e
n
t
k
,
rapidez
=
4
s
e
n
2
t
+
9
c
o
s
2
t
\bold{v}(t)=−2sent\bold{j}+3cost\bold{k}, \bold{a}(t)=−2cost\bold{j}−3sent\bold{k},\\ \text{rapidez }\; =\sqrt{4sen^2t+9cos^2t}
v
(
t
)
=
−
2
se
n
t
j
+
3
cos
t
k
,
a
(
t
)
=
−
2
cos
t
j
−
3
se
n
t
k
,
rapidez
=
4
se
n
2
t
+
9
co
s
2
t