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 :-

`25 xx10^4N`

`40 xx10^4N`

`20 xx10^4N`

`32 xx10^4N`

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