An open water tight railway wagon of mass 5 × 〖"10" 〗^"3" kg coasts at an initial velocity 1.2 m/s without friction on a railway track. Raindrops fall vertically down wards into the wagon. The velocity of the wagon after it has collected 〖"10" 〗^"3" kg of water will be 0.5 m/s  (B) 2 m/s  (C) 1 m/s  (D) 1.5 m/s

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