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A train weighing 196 tonnes experiences a frictional resistance of 5(11/22) 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
Options:
A .  5 √10 m/sec
B .  10 √5 m/sec
C .  5 √3 m/sec
D .  3 √5 m/sec
Answer: Option A
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