Q4. A spring is used to stop a box with a mass of 68 kg which is moving down a 20 incline. The spring has a constant of K = 26280 N/m and is held by cables so that it is initially compressed 101.6 mm. The velocity of the box is 3.048 m/s when it is 9.144 m from the spring. The coefficient of friction is = 0.3. Determine the following: [1%] (a) The initial kinetic energy in the box (b) Maximum additional deformation of the spring in bringing the box to rest. Partial Answer: (a) 315.87 J 3.048 m/s 68 kg = 0.3 9.144 m Spring initial compression = 101.6 mm Cable www 20 K=26280 N/m