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

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

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Applied Mechanics and Graphic Statics
One end of an elastic string of natural length ‘l’ 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 simple harmonic motion
A rectilinear motion with constant speed
A damped oscillatory motion

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

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