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The motion of the centre of mass of a system of two particles is unaffected by their internal forces

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irrespective of the actual directions of the internal forces

only if they are along the line joining the particles

only if they are at right angles to the line joining the particles

only if they are obliquely inclined to the line joining the particles

answer is B.

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Detailed Solution

Only in this case, the total effect of internal forces can be cancelled.

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