Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

Parallel to the link joining the points
None of the listed here
Perpendicular to the link joining the points
At 45° to the link joining the points

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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 constant amplitude
Oscillate with increasing time period
Oscillate with decreasing amplitude

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