Relative to a lamp post taken as origin on a straight road, a car starts from position x=−20m and stops at x=+60m. A new origin O' is chosen at the point x=+10m on the same road.
(i) Find the initial position of the car with respect to the new origin O'.
(ii) Find the final position of the car with respect to the new origin O'.
(iii) Calculate the displacement of the car for the journey when measured with respect to the new origin.