REFERENCES

1.[Online] Available http://www.titleist.com. February 12, 1997.

2.[Online] Available http://www.titleist.com/htmldocs/noframes/htmldocs/ball/hp2.html. February 12, 1997.

3.Holton, Gerald. "Elastic Collisions."Project Physics. Ed. Gerald Holton. Holt, Rinehart,Winston, 1975.19- 22.