Applied Mechanics and Graphic Statics
The centre of gravity of a homogeneous body is the point at which the whole

Volume of the body is assumed to be concentrated
Weight of the body is assumed to be concentrated
Area of the surface of the body is assumed to be concentrated
All listed here

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

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