Formula 1: S = vt Formula 2: v = at (a is acceleration) Formula 3: S = (at ^ 2) / 2 Substitute formula 2 into formula 3 to get formula 4: S = VT / 2 Q: Formula 1 obviously conflicts with formula 4. What's wrong?

Formula 1: it is suitable for uniform linear motion. In case of variable speed motion, V must be the average speed of the whole process;
Formula 2: it is suitable for uniform acceleration linear motion;
Formula 3: is also applicable to uniform acceleration of linear motion
The reason for the conflict is that it can not be substituted at will, and the average velocity of uniform acceleration motion with initial velocity 0 is equal to: vping = 0.5vt, so the substitution is correct

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