Theory of Machine
The Klein's diagram is useful to find

Velocity of various parts
Angular acceleration of various parts
Acceleration of various parts
Displacement of various parts

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Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with increasing time period
Oscillate with constant amplitude
Return to equilibrium position without oscillation
Oscillate with decreasing amplitude

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