11. What is the average speed of the moving object between 20 and 60 seconds? 1,000 800 200 0 40 80 120 Time (s) 12. An airplane accelerates on a straight runway from O to 100 km/s in 6s. What is the airplanes acceleration? 13. After 3. O s, JJ was running at 1.2 m/s on a straight path. After 7.0 s, he was running at 2.0 m/s. What was his acceleration? 14. A ruler is on the table with the higher numbers to the right. An ant crawls along the ruler from 6 cm to 2 cm in 2 seconds. Describe the ant's distance, displacement, speed and velocity. (Draw a picture if necessary)