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[" An open water tight railway wagon of mass "5times10^(3)kg" coasts at an initial velocity "],[" of "1.2m/sec" .without friction on a railway track.Rain frills vertically downwards into "],[" the wagon.What change then occurred in the velocity of the wagon,when it has "],[" collected "10^(3)kg" of water? "],[[" (A) "10m/s," (B) "3m/s," (C) "0.2m/s," (D) "9m/s]]

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An open water tight railway wagon of mass 5xx10^(3) kg coasts at initial velocity of 1.2 m//s without friction on a railway track. Rain falls vertically downwards into the wagon. What change then occurred in the kinetic energy of the wagon, when it has collected 10^(3) kg of water

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