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Question

Two bodies of masses 10 kg and 2 kg are moving with velocities 2^i7^j+3^k and 10^i+35^j3^k m/s respectively. The velocity of their centre of mass is

A
2^i m/s
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B
2^k m/s
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C
(2^j+2^k) m/s
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D
(2^i+2^j+2 ^k) m/s
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