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

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

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

A couple can be never the balanced by a single force
Algebraic sum of moments of forces, constituting a couple, about any point, is same
All listed here
Algebraic sum of forces, constituting a couple is zero

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