Applied Mechanics and Graphic Statics
Pick up the incorrect statement from the following. In a simple harmonic motion

Velocity is maximum at its mean position
Acceleration is zero at the mean position
Velocity is minimum at the end of the stroke
Acceleration is minimum at the end of the stroke

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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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