1. A plane flies a distance of 1200 km in 2.50 h. What is its average speed for the flight? 2. A group of bike riders took a 4.0-hour trip. During the first 3.0 hours, they traveled a total of 50 km, but during the last hour they traveled only 10 km. What was the group's average speed for the entire trip? 3. The average speed of a car was 60 km/hr. How long did it take the car to travel 12 km? 4. Two cars, A and B, are 400 m apart. Car A travels due east at 30 m/s on a collision course with car B, which travels due west at 20 m/s. How much time elapses before the two cars collide? 5. (a) Distinguish between a car's average speed and its instantaneous speed. (b) Which speed does the speedometer show? 6. An automobile moving at 25 m/s passes a highway patrol car moving at 23 m/s in the opposite direction. (a) What is the relative speed of the automobile as measured in the highway patrol car? (b) How far apart will the two cars be 10 s after they pass each other? Time (s) Distance (m) 0.0 0 2.0 35 40 70 6.0 105 8.0 140 10.0 175 7. The distance traveled by a car over a 10-s time interval increased as shown in the table above. (a) Plot the distance-time graph (full paged) of the motion on graph paper. (b) What does it reveal about the motion of the car? (c) Determine the distance traveled by the car at the end of 5.5 s. (d) What does the slope of the graph tell you? (e) Determine the speed of the car