Worksheet
Average Speed and Average Velocity
Which vector diagram represents the greatest magnitude of displacement for an object?
What would be the total displacement of a student who walks 3 blocks east, 2 blocks north, 1 block west, and then 2 blocks south?
A group of bike riders took a 4.0 hour trip. During the first 3.0 hours, they traveled a total of 50. kilometers but during the last hour they traveled only 10. kilometers. What was the group's average speed for the entire trip?
13 km/hr
15 km/hr
30. km/hr
40. km/hr
Now, suppose a car travels 90. meters due north in 15 seconds. Then the car turns around and travels 40. meters due south in 5.0 seconds. What is the magnitude of the average velocity of the car during this 20.-second interval?
2.5 m/s
5.0 m/s
6.5 m/s
7.0 m/s
Which set of terms pairs up an initial vector quantity with its associated scalar quantity?
acceleration and velocity
displacement and distance
speed and time
instantaneous velocity and instantaneous speed
A baseball pitcher throws a fastball at 42 meters per second. If the batter is 18 meters from the pitcher, approximately how much time does it take for the ball to reach the batter?
0.43 sec
0.86 sec
1.0 sec
2.3 sec
The position of two blocks at successive 0.20 second time intervals are represented by the numbered squares in the diagram below. The blocks are moving toward the right. Do the blocks ever have the same speed?
No.
Yes, at exactly 2.
Yes, at exactly 2 and then again at 5.
Yes, some time during interval from 3 to 4.
A motorist travels 400 km at 80 km/h and 400 km in at 100 km/h. What is the average speed of the motorist on this trip?
84 km/hr
89 km/hr
90 km/hr
91 km/hr
95 km/hr
A toy car moves 0.80 m in 0.5 s at the constant velocity. If it continues, how far will it travel in a total of 3.0 s?
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