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Standard XII
Physics
Question

The motion of centre of mass depends on
  1. total external forces
  2. total internal forces
  3. sum of (a) and (b)
  4. None of these

A
sum of (a) and (b)
B
total internal forces
C
total external forces
D
None of these
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Solution
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The motion of centre of mass depends only on the net external force.
Let M be the total mass.
→Fexternal=M→aCM

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