Rohan starts from a lamp-post taken as the origin and walks along a straight road as follows:
• 120m due east
• 80m due east again
• 50m due west
Answer the following questions.
(i) Calculate Rohan’s total distance travelled.
(ii) Calculate his final displacement from the lamp-post, stating the sign of your answer clearly.
(iii) Which of the two numerical values obtained in (i) and (ii) is larger? State a brief reason in one or two sentences.