physics
posted by Anne .
For my question about the carton's speed must I do each step you laid out or just the last one? I got the wrong answer. Thanks for your help.

physics 
bobpursley
I wish you had checked it step by step, and you would have immediately realized I mixed up the Sin, Cos terms, they are in opposite to what I typed.
Force down plane mgSinTheta, force friction mu*mg*CosTheta.
Duh on me, and duh on you for not working it through and checking. 
physics 
Anne
I worked it through and checked it didn't make sense to me. But I have to finish the assignment soon so I put the answer in anyway. Thanks for you patience.
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