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center-of-mass
One defines at instant
t
the position vector
R
CM
(
t
)
of the center-of-mass of the system of the two masses by
R
CM
(
t
) =
(
m
1
r
1
(
t
) + m
2
r
2
(
t
)
) / (
m
1
+ m
2
)
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