NEET 2010 Physics question
Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are and at any instant, then the speed of centre of mass of the system will be
Answer: (2)
Solution
Only internal forces act, so the net external force on the system is zero and the momentum of the system is conserved. Initially both particles are at rest, so the total momentum is zero and the centre of mass is at rest. Hence at every instant (option 2),
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