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

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Theory of Machine
A body is said to be under forced vibrations, when

A body vibrates under the influence of external force
None of these
There is a reduction in amplitude after every cycle of vibration
No external force acts on a body, after giving it an initial displacement

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