(10 Points) Imagine you construct a rough surface to do your physics7.-experiments. You now take a box, of mass of 2.5 kg, and you attach it to spring in order

to conduct your experiment. The box, sliding on the rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring. The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until it comes to a momentary halt, is 0.50 j (a) What is the spring constant of the spring? (b) What is the coefficient of kinetic friction between the box and the rough surface?