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Let there be a force F1 acting upon by an object 1 by an object 2.  Let there be a force F2 acting on object 2  by the object 1.  If both objects are in equilibrium then, according to the 3rd law of Newton:
                 F1 = - F2
  This pair is called action reaction force pair.

Let m1 and m2 be the masses of the two objects respectively.
     a1 = acceleration of the 1st object = F1 / m1
     a2 = acceleration of the 2nd object = F2 / m2   = F1 / m2

Hence, the magnitude of acceleration of the lighter body will be more than that of the heavier body.

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