1.one question i have just read n my book that find inst. velocity at a point ? i think it is a wrong quotation since we need atleast two points for measuring dx length so my teacher taught me that assume point p where we have to find inst. velocity thank take one point before and after p that makes dx length and solve the question but here we are not getting the accurate velocity at p. sir so dont you think that we can not find velocity at a point? Or it is like this 2.if we go to the microscopic level and see the point then there exist a length dx from one end of point to the other end forms length dx...so from here we can find inst. Velocity at a particular point by joining one microscopic end of point to origin as vector r1 and other microscopic end of point to origin as vector r2.? My question it is wrong to say that we can not find instantaneous velocity at a point it needs at least two point or my 2 explanation is correct ?