An open water tight railway wagon of mas...

An open water tight railway wagon of mass `5 xx 10^(3) kg` moves at an initial velocity `1.2 m//s` without friction on a railway track. Rain drops fall vertically downwards into the wagon. The velocity of the wagon after it has collected`10^(3) kg` of water will be :-

0.5 m/s

`0.6` m/s

1 m/s

`0.8` m/s

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