Two large blocks of wood are sliding toward each other on the frictionless surface of a frozen pond. Block a has mass 4. 00 kg and is initially sliding east at 2. 00 m/s. Block b has mass 6. 00 kg and is initially sliding west at 2. 50 m/s. The blocks collide head-on. After the collision block b is sliding east at 0. 50 m/s.