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March 31, 2015

March 31, 2015

Posted by **Nikita** on Tuesday, November 17, 2009 at 9:54pm.

My ans:

I found KE initially and then subtracted 4.4J and with the new value i recalculated v...but the answer was wrong. So I am not sure what i am doing wrong

- Physics -
**drwls**, Wednesday, November 18, 2009 at 1:14amIf the initial KE you got was 6.53 J, and you subtract 4.4 because of doing work, then the remaining KE is 2.13 J. Convert that back to velocity. It is about 57% of the initial velocity. If you got similar answers and the book says it is wrong, the difference may be in how the answer was rounded off. I would keep three significant figures until the last calculation, and then round the answer off to two figures. I cannot see what you did, or what the "book" answer is, so can't find the source of the discrepancy

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