1. __________ speed at an instant of time
KEY TERMS
1. physics
2. position
3. motion
4. scalar
5. vector
6. average speed
7. distance
8. instantaneous speed
9. average velocity
10. displacement
11. instantaneous velocity
12. acceleration
13. average acceleration
14. acceleration due to gravity
15. free fall
16. terminal velocity
17. centripetal acceleration
18. projectile motion
