
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
For an object thrown vertically upwards, in the absence of air resistance, the following relationship holds: $h=vt-\frac{1}{2}gt^2$, where $h$ is the height the object rises to, $v$ is the initial velocity when thrown, $g$ is the acceleration due to gravity ($g\approx 10m/s^2$), and $t$ is the time after being thrown. If an object is thrown vertically upwards from the ground with an initial velocity of $25m/s$, after ____ seconds it will be at a height of $20m$ above the ground.

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