1. The problem statement, all variables and given/known data The only force acting on a 2.4 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. - What is the velocity of the body at x = 4.0 m? 2. Relevant equations W = [tex]\Delta[/tex]0.5*m*v^2 that is for kinetic W = [tex]\Delta[/tex]0.5kx^2 3. The attempt at a solution I set the two equations equal to each other since no outside force is acting: [tex]\Delta[/tex]0.5*m*v^2 = -[tex]\Delta[/tex]0.5kx^2 . . . so . . . . .5(2.4)(v^2) - .5(2.4)(8^2) = - .5(6)(3^2) - .5(6)(4^2) is that right for the spring constant or is k = 6*x . . . .?