A net force along the x-axis that has x-component Fx+ -12.0N + (0.300N/m^2)x^2 is applied to a 5.00 kg object that is initially at the origin and moving in the x-direction with a speed of 6.00 m/s. What is the speed of the object when it reaches the point x=5.00 m? What is the instantaneous power at x=5.00 m?