Physical problem: As shown in the figure, a stroboscopic photo of a ball moving on a horizontal plane was taken by a stroboscopic camera that flashes 10 times per second.

Solution: Using the data given in the figure, the average speed of each segment can be found. Assume that the starting position is 0, and write down the positions 1, 2, 3... in sequence.

Because the time interval is 0.1s, which is relatively short, the average speed of two adjacent segments can represent the instantaneous speed in the middle time

v1==0.8 m/s

v2==1.15 m/s

v3==1.6 m/s

v4==2.15 m/s