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

A rectilinear motion with constant speed
None of these
A simple harmonic motion
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
Velocity is maximum at its mean position
Acceleration is zero at the mean position
Velocity is minimum at the end of the stroke

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
None of these
Isolated joint with internal forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it

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