Answer:
<em>At constant mass, the acceleration of an object varies (</em><em>directly</em><em>) with the net external force applied. That is to say, that an object's acceleration increases as the force applied is (</em><em>increased</em><em>), but its acceleration decreases if the force applied is (</em><em>decreased</em><em>).</em>
Explanation:
<u>Mechanical Force
</u>
According to the second Newton's law, the acceleration of an object varies directly proportional to the external net force applied and inversely proportional to the mass of the object.
If the mass is constant, then the acceleration will vary in the same way as the force does.
Completing the sentences:
At constant mass, the acceleration of an object varies (directly) with the net external force applied. That is to say, that an object's acceleration increases as the force applied is (increased), but its acceleration decreases if the force applied is (decreased).
