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The velocities of three particles of masses 20g,30g and 50g are 10ˆi,10ˆj and 10ˆk respectively. The velocity of the centre of mass of the three particles is :


( A ) 2ˆi+30ˆj+50ˆk
( B ) 10(ˆi+ˆj+ˆk)
( C ) 20ˆi+30ˆj+50ˆk
( D ) 2ˆi+3ˆj+5ˆk

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