Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

Vector sum of radial component and Coriolis component
Vector sum of radial component and tangential component
Vector difference of radial component and tangential component
Vector sum of tangential component and Coriolis component

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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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