Finding average acceleration over an time interal

AI Thread Summary
To find the average acceleration of an object that travels 13 m in 7.8 s and then 34 m in 1.7 s, the total distance covered is 47 m over a total time of 9.5 s. The average velocity can be calculated by dividing the total distance by the total time, resulting in an average velocity. The average acceleration is then determined by taking the change in velocity over the total time. Some participants in the discussion express confusion about whether to consider initial velocity and the proper equations to use. The final consensus suggests that the average acceleration over the entire interval is correctly calculated as 0.52 m/s².
lazyboi605
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Homework Statement



An object moving with a constant acceleration travels 13 m in 7.8 s. The acceleration is then changed and the object covers an additional 34 m in 1.7 s. What is the average acceleration of the object over the entire interval described?

Homework Equations



Xf1 = 1/2(vo +vf)t
a=(vo +vf)/t

The Attempt at a Solution



vf1 =2(13)/7.8
vo =2(34)(1.7) - 44.2
a = (115.6-44.2)9.5

im not sure how to solve this problem
 
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take it back to orginial equation... you can not break down like that...
here is my answer for you: 0.52m/s/s (starting at 0)
however please consider the starting speed...
 
can you show me what equation u used?
 
lol, this has nothing to do with acceleration equation...
you just simply add 2 total distance together and divid them by total time to get average v, then v/t=a
 
if u add the total distance and time, you only get an average velocity of one interval. The motion changes velocity.
 
do you mean average accerleration over entire time or something else? i am not quit getting it...
 
average acceleration over the entire interval
 
then my answer should be right...
 
you said average...
 
  • #10
i solved it. by finding the first velocity d/t. then the second velocity is 2(d2/t2) - v1. then acceleration is vf - vo over time
 
  • #11
dude i told you...
 
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