The radial velocity ie velocity towards or away from your starting point.
It is NOT the ordinary speed or velocity because you can run in a circle around your starting point at top speed but the distance will not change so the slope of the distance time graph will be zero.
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the physical quantity is distance and unit is meters
no, work done is the area under a force-distance graph
Unit of Measure
bar graph
Since distance is 1/2 at^2 where a is acceleration, it represents one half of the acceleration