Question 12 1 points Save A 2.5-kg box, sliding on a rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring (see the figure). 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 -0.80 J. 1.2 m/s 2.5 ks clell What is the spring constant of the spring? 1200 N/m 1040 N/m 450 N/m 800 N/m