Applied Mechanics and Graphic Statics
A cube on a smooth horizontal surface

Cannot be in unstable equilibrium
Can be in any of these states
Cannot be in stable equilibrium
Cannot be in neutral equilibrium

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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

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

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