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kerbyjonsonjr
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Homework Statement
A toy train rolls around a horizontal 1.8 m diameter track. The coefficient of rolling friction is 0.11.
What is the magnitude of the train's angular acceleration after it is released?
How long does it take the train to stop if it's released with an angular speed of 31 ?
Homework Equations
a=v2/r perhaps
The Attempt at a Solution
I am not even really sure how to begin this problem. I am pretty sure it has something to do with centripetal acceleration but I really just have no idea where to begin. Any help would be great. Thanks!