Final answer:
Increasing an object's mass while keeping force constant leads to a decrease in acceleration due to the inverse relationship between mass and acceleration according to Newton's second law.
Explanation:
Increasing the mass of an object while keeping the force constant will result in a decrease in acceleration. This is described by Newton's second law, which states that acceleration is inversely proportional to mass when force is constant. For example, if you push a heavier object with the same force as a lighter object, the heavier object will accelerate less.
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