Strobe interval

Test and analysis: the time interval of every two positions is equal, so A moves for 5 time intervals, B moves for 4 time intervals, A moves for a long time, and A and B are both wrong; As can be seen from the figure, the distance traveled by A in every equal time interval is equal, so the speed is basically unchanged, and B is right; In the picture, the distance traveled by B in the same time interval is getting bigger and bigger, so the speed of B is getting bigger and bigger.