The author uses 98% of maximal velocity to find a new conclusion, so as to give more reference to vast athletes and coaches.

The analysis and research of the elevating velocity efficiency and the maximum velocity;

The position of the maximum slider velocity in different type of slider-crank mechanism has been researched in this paper,some conclusions have been obtained,with regard to the offset slider-crank mechanism,the maximum velocity of slider is in the position where crank and linkage are in right angle,but to the centric slider-crank mechanism,the .

Using qualitative analysis and getting maximal speed by numerical value calculation,the author draws the conclusion that the two objects are unlikely to be under no stress and their speeds can t possibly reach maximum at the same time,correcting the wrong solutions to the problems about maximal speed in the papers of the physics contest.

More and more researches indicate that maximal speed is the key factor to improve 100-meter performance.

As a conclusion,the maximal speed and the continuous extension at the highest speed is the tendency of the current dash sports.

It is a relation of unite of opposites between maximum speed and keeping distance in 100m running.

According to "Technique Standards of Steel High Building" of China regarding human comfort and the background of Longtan shiplifting pylon, the peak acceleration of tailwind and beam wind and torsion acceleration at the top of the pylon were calculated in this paper.