we know that v = dr /dt here, what does r represent is it the difference in - Physics - Motion In A Plane

Question

we know that v = dr /dt here, what does r represent ? is it the
difference in position (displacement), or is it just some initial
or final position ? if it is the difference in position, in physics
part 1 txt motion in a plane, pg 75 example 4 4, they have just
given the position of the particle then, how can we find out the
velocity ? pls clarify thnx

Aditi · Accepted Answer

Dear Student ,
v = dr / dt

where dr represents difference in position and r simply represents
position