1. Most of the boys seemed to possess a squash racquet.

2. It could be something like this a squash racquet.

3. If the external force on the squash racquet were zero, then it would continue to go always with the same velocity, the center of mass.

4. And so we have here a squash racquet and we have here the center of mass.

5. The Khans will tell you that many have now replaced the rifle with another potent weapon, the squash racquet.

6. So the behavior of the center of mass is extremely predictable, whereas the behavior of the squash racquet is not.