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A train weighing 196 tonnes experiences a frictional resistance of per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is

510 m/sec
105 m/sec
53 m/sec
35 m/sec.

Correct Answer: 510 m/sec

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