Help with test question from aamc 9

[KTW2004]

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I'm a little confused with #37, when do you need to account for the affects of friction? Isn't some KE lost to friction, making the work required to stop the tire less than the initial KE? I'd appreciate any insight !! thanks

 

[punjabi4evr]

I'm a little confused with #37, when do you need to account for the affects of friction? Isn't some KE lost to friction, making the work required to stop the tire less than the initial KE? I'd appreciate any insight !! thanks

Question has been asked before. Look here
http://forums.studentdoctor.net/showthread.php?t=274894