As temperature of this substance rises from 20°c to 50°c, the substance heat and its kinetic energy .

Absorbs and Increases

Explanation: As temperature of this substance rises from 20°C to 50°C, the substance absorbs heat and its kinetic energy increases.

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Absorbs, increases.

Explanation:

As we know that the amount of heat absorb or radiate is defined by a parameter called temperature. The change in temperature is defined as the heat absorb or radiate.

In the given situation, the temperature is increased from 20°C to 50°C, this is caused due to the substance's absorption of heat.

And the temperature is defined as the measurement of average kinetic energy of all the particles which are present in object. If any body or object temperature is increasing from 20°C to 50°C than its average velocity or movement of particle becomes fast. This will lead in increase of kinetic energy.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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