Answer:
A rigid body is said to be in equilibrium when its linear acceleration and angular acceleration are zero. (i) For translation equilibrium of a rigid body, the sum of all the external forces acting on it must be zero. \[\Sigma {{\vec{F}}_{i}}=0\] (ii) For rotational equilibrium of a rigid body, the sum of torques due to all forces acting on it must be zero. \[\Sigma {{\vec{\tau }}_{i}}=0\]
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