Theory of Machine
Angular acceleration of a link can be determined by dividing the

Resultant acceleration with length of link
All of these
Tangential component of acceleration with length of link
Centripetal component of acceleration with length of link

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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 decreasing amplitude
Oscillate with constant amplitude
Return to equilibrium position without oscillation

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