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80 railway wagons all of same mass 5xx10...

80 railway wagons all of same mass `5xx10^(3)`kg are pulled by an engine with a force of `4xx10^(5)`N. The tension in the coupling between 30 th and st 31st wagon from the engine is :-

A

`400xx10^(4)N`

B

`32xx10^(4)N`

C

`20xx10^(4)N`

D

`25xx10^(4)N`

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The correct Answer is:
D
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