Applied Mechanics and Graphic Statics
A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be

1.5 m/sec
0.5 m/sec
2.5 m/sec
3.5 m/sec

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Applied Mechanics and Graphic Statics
The angle of friction is:

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

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