Physics Help Forum Determine velocity when given force function
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 Apr 4th 2017, 04:47 PM #1 Junior Member   Join Date: Apr 2017 Posts: 1 Determine velocity when given force function I integrated the function between x=5 and x=9 and got 60 joules. Then I set that equal to (1/2)mv^2 and solved for velocity. I got 9.60 m/s. Is this correct? My professor said the answer would be about 9 m/s. Attached Thumbnails
 Apr 4th 2017, 06:15 PM #2 Physics Team     Join Date: Jun 2010 Location: Naperville, IL USA Posts: 2,179 I get an answer much closer to 9 m/s (not exactly 9 though). Show us your work - the integral of Fdx from x = 5 to x = 9 is not 60 joules (be careful of the sign of the cubic portion of the integral).

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