(20 14? The photography technique of recording the position of a moving object on the same negative regularly through multiple exposures is called stroboscopic.

Stroboscopic photography is exposed every same time interval, and the displacement in every two adjacent exposure time intervals is one grid, which shows that the horizontal component motion is uniform linear motion;

The vertical direction is always the same height as the free-falling ball, so the vertical component motion is free-falling motion;

So the answer is: the horizontal displacement is equal in time, and the vertical displacement is synchronous with the free fall.