Question: A force in the +x-direction with magnitude F(x) = 18.0 N - (0.530 N/m) x is applied to a 6.00-kg box that is sitting on a frictionless surface. F(x) is the only horizontal force on the box.
Part A: If the box is initially at rest at x = 0, what is its speed after it has traveled 14.0 m?
Please help for the above question, totally confused!! Show each steps if possible, Thanks.