## kaydra14 one year ago A roller coaster starts down a hill at 10 m/s. Three seconds later, its speed is 32 m/s. What is the roller coaster’s acceleration? 7.3 m/s 2 7.3 m/s -7.3 m/s 2 -7.3 m/s

1. petiteme

Do you know how to calculate the acceleration?

2. kaydra14

no can you help me

3. petiteme

Ok, sure. Let's use the formula: $A = \frac{ Vf - Vi }{ t }$ Can you substitute the values?

4. kaydra14

can you give me an example

5. petiteme

Based on your question, what do you think is the final velocity?

6. kaydra14

32

7. petiteme

8. kaydra14

10 m/s

9. petiteme

10. kaydra14

3

11. petiteme

Great! You can substitute it already :)

12. kaydra14

thank you i think i got it now

13. petiteme

Okiedokes :) Good job!

14. kaydra14

when i solve the problem should it me m/s or m/s 2

15. kaydra14

when i solve the problem should it me m/s or m/s 2 @petiteme

16. petiteme

$m/s ^{2}$