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

A train weighing 196 tonnes experiences a frictional resistance of 5(1

1.	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
A.	5√10 m/sec
B.	10√5 m/sec
C.	5√3 m/sec
D.	3√5 m/sec.
Answer» B. 10√5 m/sec