Two objects with masses m1 and m2 are moving along the x-axis in the
positive direction with speeds v1 and v2, respectively, where v1 is less than
v2. The speed of the center of mass of this system of two bodies is
a) less than v1.
b) equal to v1.
c) equal to the average of v1 and v2.
d) greater than v1 and less than v2.
e) greater than v2.
d) greater than v1 and less than v2.
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