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

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

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Applied Mechanics and Graphic Statics
The angle of friction is:

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

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