Two pieces of clay are moving directly toward each other. When they collide, they stick together and move as one piece. One piece has a mass of 347 grams and is moving to the right at a speed of 1.17 m/s. The other piece has mass 642 grams and is moving to the left at a speed of 0.924 m/s.
What fraction of the total initial kinetic energy is lost during the collision?