The masses
m
i
are located at the points
P
i
. Find the center of mass of the system.
m
1
=
1
,
m
2
=
2
,
m
3
=
3
.
P
1
=
(
7
,
8
)
,
P
2
=
(
−
6
,
−
2
)
,
P
3
=
(
−
8
,
5
)
.