Where have i gone wrong with this basic mechanics question?

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The discussion revolves around a basic mechanics homework question where the initial mass was incorrectly stated as 18kg instead of 8kg. The poster is seeking feedback on their solution attempt, specifically regarding the final calculation for velocity. Respondents confirm that the overall approach appears correct but advise caution with rounding during calculations. The emphasis is on ensuring accuracy in the final arithmetic step. Proper attention to detail in calculations is crucial for achieving the correct answer.
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Homework Statement



[PLAIN]http://img155.imageshack.us/img155/7789/questionz.jpg

The Attempt at a Solution



[PLAIN]http://img826.imageshack.us/img826/1492/myatteptm.jpg

NOTE - it said as an aside it was meant to be 8kg and not 18!
 
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Redo the arithmetic in the last step, when solving for v.
 
Doc Al said:
Redo the arithmetic in the last step, when solving for v.

thanks! does the rest of it look ok?
 
coffeem said:
does the rest of it look ok?
Yes, it looks fine. My only suggestion is that you be careful about rounding off too soon.
 
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