Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

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

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Applied Mechanics and Graphic Statics
The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is ½, the velocities of separation of the balls will be equal to

Original velocity in the opposite direction
Half the original velocity in the opposite direction
Half the original velocity in the same direction
Original velocity in the same direction

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