A box of unknown mass is sliding with an initial speed

v_i = 4.50 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 3.90 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100. Using energy considerations, determine the final speed of the box (in m/s) after sliding across the rough section of flooring.