Applied Mechanics and Graphic Statics
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

5 √3 m/sec
3 √5 m/sec
10 √5 m/sec
5 √10 m/sec

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Applied Mechanics and Graphic Statics
The angle of friction is:

The ratio of the friction and the normal reaction
The force of friction at which the body is just about to move
The force of friction when the body is in motion
The angle between the normal reaction and the resultant of normal reaction and limiting friction

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