Answers to motion problems

1. Use v = d/t for your values.

2. 1.2 sec

3. No difference

4. Speed at a particular "instant" - essentially, what a speedometer tells you

5. 1.5 m/s/s

6. 3 x 10^8 m, (60) 3 x 10^8 m, (31,557,600) 3 x 10^8 m

7. Slowing down,relative to the forward direction

8. 3.75 m/s/s, 120 m

9. 9.8 m/s/s, the amount by which an object's speed changes with each second of freefall (whether you're moving up OR down)

10. 1/6 of an Earth g for the Moon; Jupiter, about 2.5 Earth g's

11. 5 x 9.8 m/s/s

12. 31 m

13. 29.4 m/s

14. 4.5 s

15. 2.2 sec