Do you have any key points? It's formulas, and some fallible knowledge

Do you have any key points? It's formulas, and some fallible knowledge

1. Definition of speed: in uniform linear motion, speed is equal to the distance that the object passes in unit time. Formula: the unit of speed is: M / S; km / h. 1 m / S = 3.6 km / h. 2. Average speed: in variable speed motion, the speed of the object in this distance can be obtained by dividing the total distance by the time used