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[" 1) "(2R)/(3)" 2) "2R],[" 12.A boy of ...

[" 1) "(2R)/(3)" 2) "2R],[" 12.A boy of mass "50kg" is standing at one end of "],[" a boat of length "9m" and mass "400kg" .He "],[" runs to the other end.The distance through "],[" which the centre of mass of the boat boy "],[" system moves is "],[[" 1) "0," () "1m," 3) "2m," 4) "3m]]

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