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

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

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it
Isolated joint with internal forces acting on it
None of these

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