Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Perpendicular to line as per (A)
Not possible to determine with these data
Joining the corresponding points
At 45° to line as per (A)

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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
No external force acts on a body, after giving it an initial displacement
There is a reduction in amplitude after every cycle of vibration

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