Applied Mechanics and Graphic Statics
A particle moving with a simple harmonic motion, attains its maximum velocity when it passes

Through a point at half amplitude
None of these
The extreme point of the oscillation
Through the mean position

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of vertical components of all the forces must be zero
All (A), (B) and (C)
Algebraic sum of horizontal components of all the forces must be zero
Algebraic sum of the moments of the forces about a point must be zero

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