
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
According to Newton's law, the cooling rate of a body in the air is proportional to the difference between the temperature of the body $T$ and the air temperature $T_{0}$. Determine the law of temperature change of the body over time, given that the experiment is conducted at $T_{0}=20^{\circ} \mathrm{C}$, and the body cools from 100 to $60^{\circ} \mathrm{C}$ in 20 minutes.

Present the answer in LaTex format: \boxed{Your answer}
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