Velocity -Time Graph 50 40 30 20 Velocity (m/s) !! ! ! O 20 25 30 -10 -20 -30 -40 Time (s) QUESTIONS 7 THROUGH 12 REFER TO THE ABOVE VELOCITY TIME GRAPH. One mark each 7. Which of these objects display uniform acceleration? a. A and B b. A and C C. A, B and C d. D e. None of them . Which of these objects experience a negative velocity? a. A b. B C. d. D 9. What is the displacement of Object B from 0 to 40 seconds? Approximately +960 m b. Approximately +22 m C. Approximately +480 m d. Approximately +240 m pg. 310. What distance did object C travel from 15 to 40 seconds? a. Approximately +375 m b. Approximately +960 m C. Approximately -375 m d. 0m What is the acceleration of Object C? a. 1.2 m/$2 b. 0 m/s2 C. -1.2 m/$2 d. -960 m/s2 12. What is the acceleration of Object A at 10 seconds? a. -2 m/s2 b. -10 m/s2 C. -10 m/s . +2 m/s2 B: Short Answer and Calculations **SIG FIGS applicable except #1 and #4 1. Use the following velocity time graph to draw a corresponding displacement-time graph. Label each plotted point on your displacement time graph with its coordinates (x,y). Graph paper attached. (8marks) V-T GRAPH 20 15 LO VELOCITY (M/S) 0 -5 10 10 15 20 25 TIME (SECONDS) pg. 42. 3. A car initially moving at 17.0 m/s accelerates to a speed of 48.0 m/s in 11.0 seconds. Determine the following: {4 marks) a. The acceleration b. The distance covered in the 11.0 seconds. Frank and Mark are flying a helicopter and are moving straight upwards with a velocity of 14.5 m/s when Frank drops Mark's calculator out ofthe helicopter. (5 marks) a. How many seconds elapse before the calculator reaches a velocity of zero? b. How many seconds elapse before the calculator reaches a velocity of 14S.0 m/s? c. lfthe helicopter continues to ascend at the same rate, how far apart are the calculator and the helicopter when the calculator reaches a velocity of 145.0 m/s? pg. 5 . Using a graphical approach, find the resultant of the following 3 vectors. Remember to show your work. Label and state your resultant. (5 marks) 120 m/s [South] + 105 m/s [N 70 E] - 75 m/s [E 35. S] 5. A sailboat heads out on the Pacific Ocean at 18.0 m/s [S 27.0' W]. Find the south and the west component of the boat's velocity. (2 marks) pg. 66. An airplane heads from Calgary, Alberta to Sante Fe, New Mexico at [S 31.0 E] with an airspeed of 533 km/hr (relative to the air). The wind at the altitude of the plane is 58.5 km/hr [N 41.5\" E] relative to the ground. Use a trigonometric approach to answer the following. (4 marks) a. What is the resultant velocity of the plane, relative to the ground (groundspeed')? 7. A punter kicks a football at an angle of 32.0u above the horizontal. The football lands 87.8 m from the point it was kicked 4.32 seconds later. {4 marks} a. What was the launch speed ofthe football? b. What is the maximum height that was reached by the football? pg. 7