How to judge which physical formula to use in the research of uniform velocity linear motion?

There are four physical formulas of uniform speed change linear motion
1. Velocity formula: vt-v0 = a * t
2. Displacement formula: S = V0 * t + A * T ^ 2 / 2
3. The relationship between velocity and displacement: VT ^ 2-v0 ^ 2 = 2 * a * s
4. Average velocity formula: vmean = (VT + V0) / 2
There are four physical quantities in the above formulas. When solving the problem, we should flexibly use the above formulas according to the conditions given by the topic to know "three seek one"

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