NDA 2023 Physics question
A railway wagon (open at the top) of mass is moving with speed along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes and speed becomes . Taking the rain to be falling vertically and water stationary inside the wagon, the relation between the two speeds and is :
Answer: (C)
Solution
The rain falls vertically, so it brings no horizontal momentum, and no external
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