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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

A

1200J

B

300J

C

600J

D

900J

Text Solution

Verified by Experts

The correct Answer is:
C

At a height h, total energy E=P.E=mgh
at a height `(4h)/5`, the P.E=`4/5`(mgh)
and K.E=mgh-`4/5`mgh=`1/5`mgh
`:." "(P.E)/(K.E)=(4.5mgh)/(1/5mgh)=4/1`
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