Theory of Machine
Sense of tangential acceleration of a link

Is opposite to that of velocity
Is perpendicular to that of velocity
Is same as that of velocity
Could be either same or opposite to velocity

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Theory of Machine
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The sum of the two masses is equal to the total mass of body
The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
All of these
The center of gravity of the two masses coincides with that of the body

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