Applied Mechanics and Graphic Statics
A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is

2.5 m/sec
0.5 m/sec
1.0 m/sec
1.5 m/sec

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Angle between normal reaction and resultant of normal reaction and limiting friction
Friction force acting when the body is just about to move
Friction force acting when the body is in motion
Ratio of limiting friction and normal reaction

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