5 Questions

Answer each question by choosing the correct answer from the choices available.

Questions and Answers

- 1.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?
- A.
40. km/hr

- B.
30. km/hr

- C.
15 km/hr

- D.
60. km/hr

- 2.One car travels 40. meters due east in 5.0 seconds, and a second car travels 64 meters due east in 8.0 seconds. During their periods of travel, the cars definitely had the same
- A.
Total displacement

- B.
Average velocity

- C.
Average speed

- D.
Change in momentum

- 3.The speed of a car is decreased uniformly from 30. meters per second to 10. meters per second in 4.0 seconds. The magnitude of the car's acceleration is
- A.
5.0 m/s2

- B.
10. m/s2

- C.
40. m/s2

- D.
20. m/s2

- 4.A car having an initial velocity of 12 meters per second east slows uniformly to 2 meters per second east in 4.0 seconds. What is the acceleration of the car during this 4.0-second interval?
- A.
2.5 m/s2 west

- B.
2.5 m/s2 east

- C.
6.0 m/s2 east

- D.
6.0 m/s2 west

- 5.Two cars, A and B, are 400. meters apart. Car A travels dueeast at 30. meters per second on a collision course withcar B, which travels due west at 20. meters per second. Howmuch time elapses before the two cars collide?1) 2) 8.0 s3) 20. s4) 40. s
- A.
13 s

- B.
8.0 s

- C.
20. s

- D.
40. s