An open water tight railway wagon of mas...

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

`10m//s`

`3m//s`

`0.2m//s`

`9m//s`

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