Theory of Machine
Inertia force acts

Along the direction of acceleration force
None of the listed here
Perpendicular to the acceleration force
Opposite to the direction of acceleration force

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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

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

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