Question

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newtons second law of motion states that the acceleration of an object is proportional to the mass of the object and proportional to the net force acting on it.
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Explanation:

Newton's second - law is $F = ma$, which can be rewritten as $a=\frac{F}{m}$. So acceleration $a$ is inversely proportional to mass $m$ and directly proportional to net - force $F$.

Answer:

inversely, directly