= Problem1 A spring is used to stop a 60-kg package which is sliding on a horizontal surface. The spring has a constant k 20 kN/m and is held by cables so that it is initially compressed 120 mm. Knowing that the package has a velocity of 2.5 m/s in the position shown and that the maximum additional deflection of the spring is 40 mm, determine (a) the coefficient of kinetic friction between the package and the surface (b) the velocity of the package as it passes again through the position shown. 2.5 m/s -60 kg- Cable 600 mm-