can someone please help me with this problem? A 10kg cart with low friction wheels has a 4000N/m spring on one end. The cart is pressed against the wall so that the spring is compressed 0.50m. The cart is released and rolls on the surface only to hit another identical cart. The two carts lock together and run into a wall on the other side of the room where a 4000N/m spring on the second cart compresses until the carts stop. How far does the second spring compress as the carts stop? I think i need to break it up into three parts. For the first one i need to find the force of the s[ring then the collision of hte two carts and then the compression of the spring. So for the first part i did: PEs = (1/2) k(x^2) = (1/2)(4000N/m)(0.50^2) = 1000J is that right for the first part?