ScrollingSettings.AccelerationRatio Attached Property
Gets or sets the acceleration ratio of the scrolling speed (in pixels per second squared), when scrolling using scroll buttons. This is an attached property.
A double precision floating-point value specifying the scrolling speed’s acceleration ratio (in pixels per second squared).
When scrolling is initiated by an end-user (by pressing and holding down a scroll button), the AccelerationRatio property specifies the scrolling speed acceleration - how fast the scrolling speed can be changed from 0 to ScrollingSettings.ScrollSpeed.
To learn more, see the Scrolling topic.