Explanation
When particle moves away from the origin then at position x = x1 force is zero and at x > x1, force is positive (repulsive in nature) so particle moves further and does not return back to original position. i.e., the equilibrium is not stable .Similarly at position x = x2 force is zero and at x > x2, force is negative (attractive in nature) .So, particle return back to original position i.e, the equilibrium is stable.
Momentum and kinetic energy is conserved only in this case.
All the central forces are conservative.
Change in kinetic energy = work done by net force. This relationship is valid for particle as well as system of particles.
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