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Part D - Application (Full Solutions are Required) [20 marks] 0.85kg 15. Cart A (mA = 850 g) has a velocity of 4 m/s [right] and is moving along a frictionless surface towards cart B (ms = 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 1.2 kN/m. 120ON Spring F = kx yz A W B 10 , 85 ) ( 4 ) + (0, 45 ) ( - 1, 0)= (0.85 ) ( VA' ) + (01 45 ) (VB' ) marks] a. What is the amount by which the spring is compressed when the separation of the carts is at a minimum? [ b. What is the speed of each cart after the collision? [5 marks]