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How far did the car travel in the fourth second?

  • #1

Homework Statement


A car accelerates from 14 m/s to 26m/s in 4s. How far did the car travel in the fourth second?


Homework Equations


a=vf-vi/t = 26-14/4=3

d=vf^2-vi^2/2a=26^2-14^2/3=80


The answer is 24.5, but I keep getting 80 and I don't know why.
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31


Your answer is correct, perhaps the book is wrong?
 
  • #3
31
0


You've worked out the distance travelled in four seconds, the question is asking for the distance travelled in the fourth second.

If you're still stuck;

Try using the equation d = vi * t + (0.5 * a * t2)
Use it to work out how far the car travels in three seconds, then how far it travels in four seconds (your value of 80m is correct).
Then use the two to work out how far it travelled in the fourth second.
 

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