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[" 22.A boy of mass "50kg" is standing a...

[" 22.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 "],[" boat moves back is "],[[" 1."0," 2."1m," 3."2m," 4."3m]]

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