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It will be 1/500 of a second = 0.002 seconds.
Acceleration is a change in speed, measured per second and so would be meters per second per second or meters per second squared.
Rivers are typically measured in terms of their length using units such as kilometers or miles. The length of a river is usually determined by measuring the distance from its source to its mouth. Additionally, the discharge of a river, which is the volume of water flowing through it per unit of time, can be measured in cubic meters per second or cubic feet per second.
Stride rate refers to how fast a person's legs cycle between the left and right foot. If you take 2 steps per second (one left, one right) then your stride rate is 1 stride per second (a stride is made up of both a left and a right step). Most stride rates are measured in strides or steps per minute. One stride per second is the same rate as 60 strides per minute.
You count the number of cases stacked over a period of time which is measured in hours. Divide the first by the second.