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

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

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

a rectilinear motion with constant speed
None of these
a simple harmonic motion
a damped oscillatory motion

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