Stroboscopic photography is a commonly used experimental method to study variable speed motion. In the darkroom, the shutter of the camera is always open, and the stroboscope sends out a signal every

Stroboscopic photography is a commonly used experimental method to study variable speed motion. In the darkroom, the shutter of the camera is always open, and the stroboscope sends out a signal every once in a while. (1) The object in free fall is only acted by gravity, and it is a linear motion with uniform change (or uniform acceleration) with zero initial velocity;

(2) There are many ways to measure the acceleration of a free fall through this picture, such as:

(1) passes δs = at2, where T=0.04s?

② Use S= 12gt2 to measure the distance s between the landing point and a certain position in the figure, determine the corresponding time t, and substitute it into the formula to solve.

③ Calculate the instantaneous speed of a certain position in the figure: the instantaneous speed in the middle of a period of time is equal to the average speed of this period of time; Then use vt = gt.

So the answer is:

(1) uniformly variable linear motion (or uniformly accelerated linear motion) with zero initial velocity?

(2) There are many ways to measure the acceleration of a free fall through this picture, such as:

(1) passes δs = at2, where T=0.04s?

② Use S= 12gt2 to measure the distance s between the landing point and a certain position in the figure, determine the corresponding time t, and substitute it into the formula to solve.

③ Calculate the instantaneous speed of a certain position in the figure: the instantaneous speed in the middle of a period of time is equal to the average speed of this period of time; Then use vt = gt.