Question

vii)
What is mechanical equillibrium?
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Answer 1

Answer:

In classical mechanics, a particle is in mechanical equilibrium if the net force on that particle is zero. By extension, a physical system made up of many parts is in mechanical equilibrium if the net force on each of its individual parts is zero.

Answer 2

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A mechanical equilibrium exists when all the mechanical forces within a system are balanced so that there is no acceleration. ... For a system to be in thermodynamic equilibrium it should be in mechanical, thermal, phase and chemical equilibrium

For an object to be in equilibrium, it must be experiencing no acceleration. This means that both the net force and the net torque on the object must be zero.