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The average kinetic energy for a substance or object is directly proportional its temperature
according to the statement, which answer best describes how a substance would be affected if its temperature increased?
1. The substance mass would decrease
2. The substance's mass would increase
3. The substances average kinetic energy would decrease
4. The substance's average kinetic energy would increase

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4. the substance's average kinetic energy would increase.
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Answer:

The answer is 4. The substance's average kinetic energy would increase.

Explanation:

The fact that a property is directly proportional to another means that if the first property changes in any direction, the second property changes in this direction too. In this case, if temperature changes by increasing the kinetic energy is going to increase too.

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