Question 1. A block of mass 6.3 kg slides on a flat, horizontal frictionless surface at a speed of 8.9 m/s. It comes into contact with the end of an ideal spring, the other end of which is attached to a xed wall. The spring has a spring constant of k = 1200 N/m. The spring is able to push to the left on the block, but it is not able to pull on the block. The block compresses the spring, then turns around and slides to the left at its original speed of 8.9 m/s. How long was the block in contact with the spring