1. What kind of speed is registered by an automobile speedometer: average speed or instantaneous speed?

2. What is the average speed in kilometers per hour of a horse that gallops a distance of 15 km in a time of 30 min?

3. Show that the acceleration of a hamster is 5 m/s2 when it increases its velocity from rest to 10 m/s in 2 s.

4. Show that the hamster in the preceding problem travels a distance of 22.5 m in 3 s.

5. What is the instantaneous velocity of a freely falling object 10 s after it is released from a position of rest? What is its average velocity during this 10-s interval? How far will it fall during this time?

6. Ranking Question:

Three balls of different masses are thrown straight upward with initial speeds as indicated. 15 m/s 10 m/s 3 m/s A A B C 1.0 kg 1.5 kg 0.8 kg a. From fastest to slowest, rank the speeds of the balls I s after being thrown. b. From greatest to least, rank the accelerations of the balls 1 s after being thrown. (Or are the accelerations the same?)