A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure below. When the car changes speed it does so uniformly. Select the appropriate choice for each statement. Distance (m) 1000 800 600 400 200 0 20 Fal Greater than Greater than Greater than 40 Time (a). 60 At 7 sec, the speed is as high as it gets. The speed at 73 sec is..... the speed at 7 sec. The speed is ..... zero at 29 sec. The acceleration magnitude at 15 sec is..... the acceleration magnitude at 37 sec. Equal to a The x-acceleration is ..... zero at 15 sec. Greater than The x-acceleration is ..... zero at 20 sec. 80 You are partially correct. Your receipt no. is 156-4788 By extrapolating the straight sections of the graph, you can estimate the time during which the speed is changing. This, with the change in speed, should let you estimate the magnitude of the acceleration. Submit Answer Tries 9/99 Previous Tries Using the graph above, calculate the average speed of the car for the period from 0 to 30.0 s 20 m/s Submit Answer Incorrect. Tries 2/99 Previous Tries