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

Question

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

petiteme · Answer

Do you know how to calculate the acceleration?

kaydra14 · Answer

no can you help me

petiteme · Answer

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

kaydra14 · Answer

can you give me an example

petiteme · Answer

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

kaydra14 · Answer

32

petiteme · Answer

32 m/s :) That's your Vf = Final Velocity. What about your initial velocity?

kaydra14 · Answer

10 m/s

petiteme · Answer

Good! That's your Vi = Initial velocity. What about the time?

kaydra14 · Answer

3

petiteme · Answer

Great! You can substitute it already :)

kaydra14 · Answer

thank you i think i got it now

petiteme · Answer

Okiedokes :) Good job!

kaydra14 · Answer

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

kaydra14 · Answer

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

petiteme · Answer

$$m/s ^{2}$$