A student walks in a straight corridor that has its zero mark at the main entrance. Starting from the entrance, she performs the following steps in succession:
• 120 m towards the physics laboratory (taken as the +x direction)
• 70 m back towards the entrance
• 50 m further towards the physics laboratory
(a) Mark the position of the student on a one–dimensional number line after each stage of motion.
(b) Find the total distance covered after the three stages.
(c) Determine the net displacement of the student from the entrance.
(d) Compute the ratio ∣displacement∣distance correct to two decimal places.