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Two masses m1 and m2 sit at x1 and x2. Where is their centre of mass?
A(m1x1 - m2x2)/(m1 + m2)
B(m1x2 + m2x1)/(m1 + m2)
C(m1x1 + m2x2)/(m1 + m2)
D(m1 + m2)/(m1x1 + m2x2)
Answer & Solution
Correct answer: C. (m1x1 + m2x2)/(m1 + m2)
The centre of mass is the mass-weighted average of positions, the sum of m x divided by total mass.
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