s
h
o
w
p
o
s
i
t
i
o
n
v
e
l
o
c
i
t
y
t
i
m
e
2
.
5
i
n
i
t
i
a
l
p
o
s
i
t
i
o
n
s
x
1
(
0
)
x
2
(
0
)
i
n
i
t
i
a
l
v
e
l
o
c
i
t
i
e
s
v
1
(
0
)
l
i
n
k
e
d
t
o
f
i
x
t
h
e
c
e
n
t
e
r
o
f
m
a
s
s
v
2
(
0
)
l
o
g
2
(
m
1
)
-
2
l
o
g
2
(
m
2
)
0