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Question
If the net external force acting on the system of particles is zero, then which of the following may vary?
Options
Momentum of the system
Kinetic energy of the system
Velocity of centre of mass
Position of centre of mass
MCQ
Solution
Position of centre of mass
Explanation:
When there is no external force acting on the system, velocity remains unaltered, which also means that momentum and kinetic energy do not change. However, internal forces may or may not cause the position of the centre of mass to alter.
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