Only need to write the discussion for me. Thank you. 1. The purpose to make stud

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Only need to write the discussion for me. Thank you.
1. The purpose to make students understand what the speed is, understanding of uniform motion.
2. Distance 4 get the most fastest speed, and distance 2 get the most slowly speed.
3.With the same average time, the farther the distance, the faster the speed. The moving object travels the same distance per unit time. If the moving direction and speed are constant, then the speed of the object will also be constant.
4. The error is that it may not take into account the friction on the ground or the inherent inertia of the object.

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