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Question

An open water tight railway wagon of mass 5×103kg coasts at an initial velocity of 1.2m/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 103 kg of water ?

A
1200 J
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B
300 J
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C
600 J
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D
900 J
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Solution

The correct option is B 600 J
From COCM
5×103×1.2=6×103V
V=1m/s
ΔKE=12mv212mv2
=12×5×103×(1.2)212×6×103(1)2
=600J

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