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Q.

Two bodies of different masses 2kg and 4kg are moving with velocities 2m/s and 10m/s towards each other due to mutual gravitational attraction. Then the velocity of the centre of mass is

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a

5ms–1

b

6ms–1

c

8ms–1

d

Zero

answer is D.

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Detailed Solution

vcm=m1v1+m2v2m1+m2;Internal force does not change the position of centre of mass
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