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[80" railway wagons all of same mass "5t...

[80" railway wagons all of same mass "5times10^(3)kg],[" are pulled by an engine with a force of "4times],[10^(5)N" .The tension in the coupling between "],[30" th and "31" st wagon from the engine is "],[[" a) "25times10^(4)N," b) "40times10^(4)N],[" c) "20times10^(4)N," d) "32times10^(4)N]]

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