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It is false that the condition ∑ Fi = 0 is sufficient to assure that a rigid body is in equilibrium.
It is false because torque has to be zero as well as force. 

Answer:

The given statement:

The condition ∑ Fi = 0 is sufficient to assure that a rigid body is in equilibrium is a

TRUE statement.

Step-by-step explanation:

According to the condition for the equilibrium of a rigid body, the vector sum of all the forces acting on the body must be zero.

The first condition of equilibrium for a rigid body is as follows:

                             ∑ Fi = 0

where the expression  ∑ Fi are the sum of all the forces acting on the body.

Hence, the given statement is a TRUE statement.

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