Part D - Application (Full Solutions are Required) [20 marks] 15. Cart A (m_(A) ) = ( 850(g)) has a velocity of 4(m)/(s) [right] and is moving along a frictionless surface towards cart B(m_(B) ) = ( 450(g)) , which is moving at 1.0(m)/(s) [left]. Attached to cart B is a long spring, oriented horizontally, as shown in the diagram below. The spring has a spring constant of 1.2k(N)/(m) . a. What is the amount by which the spring is compressed when the separation of the carts is at a minimum? [5 marks] b. What is the speed of each cart after the collision? [5 marks]