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This
multiflash photo of a single racquetball striking a hard surface shows the various
stages of the collision. During the collision, the 10
successive images were swept horizontally across the film using a
rotating mirror. The time interval between images was 0.75 ms.
The
racquetball actually struck the surface at 90°. The appearance
of an oblique collision results from the fact that the images are
being swept horizontally while the ball moves vertically. The
horizontal dimension is in effect a time scale.
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