"Stroboscope photography" is an experimental method commonly used when studying the movement of objects. Photography is done in a dark room, with the flash flashing at regular intervals.

C

Test question analysis: The time intervals between each two positions are equal, so A moved for 5 time intervals and B moved for four Time interval, A's movement time is long, A and B are wrong; as can be seen from the figure, A travels the same distance in each equal time interval, so the speed is basically unchanged, B is right; B in the figure is in the same time interval The distance traveled is getting bigger and bigger, so the speed of B is getting bigger and bigger. D is wrong.