Question

Essential characteristic of equilibrium is :

a) momentum is zero
b) acceleration is zero
c) kinetic energy is zero
d) velocity is zero

Answer 1

Dear Student,
Please find below the solution to the asked query: During the equilibrium state, the system should be either in rest or in uniform motion.Hence, the acceleration is zero for a system in equilibrium.Correct option: (b)

Hope this information will clear your doubts about Equilibrium.
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Answer 2

hey there!!

answer (b) is correct

If you want learn this 
http://www.slideshare.net/wehaa/physics-equilibrium 

:)