1-D Motion Problem

  • Thread starter kfink85
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  • #1
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A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. (a) Find the truck's original speed. (b) Find it's acceleration.

I used the 2nd formula originally (X=VoT+1/2aT^2) but I wasn't getting anywhere. Can someone point me in the right direction on how to do this problem? Any help is appreciated. Thanks.
 

Answers and Replies

  • #2
Doc Al
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Try figuring out the average speed of the truck and see what that tells you.
 
  • #3
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I found it to be 4.71 m/s but I'm still stuck. Where do I go next?
 
  • #4
Doc Al
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Good. Now use that to find the initial speed:
[tex]v_{ave} = (v_i + v_f)/2[/tex]
 
  • #5
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Thanks for your help. I really appreciate it.

I got 6.62 m/s for part A and used V=Vo+at to get -.45m/s^2 on part B.

I hope this is correct. I'm pretty sure A is.

Can anyone confirm?
 
Last edited:
  • #6
Doc Al
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Looks good to me.
 

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