Posted by Anonymous on Friday, October 21, 2011 at 9:18pm.
The only force acting on a 2.3 kg body as it moves along the positive x axis has an x component Fx =  6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s.
At what positive value of x will the body have a velocity of 5.0 m/s?
I'm not sure how to approach this. So far I have written down KE=(1/2)mv^2,
but I haven't the slightest idea where to go from here...

PHYSICS  drwls, Saturday, October 22, 2011 at 2:18am
What you have is a springmass system, with spring constant 6.0 N/m.
Total energy, which is constant, is
(1/2)kX^2 + (1/2)MV^2
= 3*9 + 1.15*64 = 100.6 J
(using data at the X = 3.0 m location)
Solve for X when V = 5 m/s
100.6 = 3*X*2 + 1.15*25
X^2 = 23.95 m^2
X = 4.9 m
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