8. A rock is thrown vertically upwards with a speed v from the edge of a cliff. At the same moment, a second rock is thrown vertically downwards with the same initial speed v. Ignoring wind resistance, which of the following statements regarding the motion of the rocks is true? a. The rock which was thrown upwards reaches the bottom of the cliff with a larger velocity. b. The rock which was thrown downwards reaches the bottom of the cliff with a higher velocity. c. Both rocks reach the bottom of the cliff with the same velocity at the same time. d. Both rocks reach the bottom of the cliff with the same velocity at different times. 9. A bus travels a distance of 250 km [N] before turning and travelling 110 km [W]. What is the total magnitude of displacement of the bus? a. 270 km b. 360 km c. 140 km d. 750 km 10. An ocean liner travels a distance of 750 km [E] before turning and travelling 370 km [S]. What is the direction of the total displacement of the ocean liner? a. E 36'S b. S 36 E C. E 64'S d. S 64 E