Two 500 g block of wood are 2.0m apart on a frictionless table. A 10g bullet is fired at 400 m/s towards the blocks. The bullet passes all the way through the first block (the block does not lose any mass as the bullet passes through), and then embeds itself in the second block. The speed of the first block immediately afterwards is 6.0m/s. What is the speed of the second block after the bullet stops?