Walter A. "Butch" Kennedy

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Walter A. “Butch” Kennedy served in the US Army from 1965 to 1968.  Shortly after his discharge he joined the Jacksonville Sheriff’s Office (Florida).  During his 17 year law enforcement career he has worked patrol, traffic and training.  In 1983, he was awarded a Medal of Merit for Bravery.  Between 1986 and 1992, he was a full-time instructor at the Institute of Police Technology and Management (Florida).  Walter Kennedy is the author Conservation of Linear Momentum Using Vector Sum Analysis and Impact Velocity from Conservation of Linear Momentum for the Traffic Accident Investigator and reconstructionist.


According to the book description of Conservation of Linear Momentum Using Vector Sum Analysis, it “is difficult for even the experienced reconstructionist to visualize the momentum components of colliding vehicles. To conquer this problem, W. A. Kennedy has drawn a series of “pictures” that present a graphic solution to the momentum equations. In this book, the author uses a coordinate system to graphically illustrate the vector components of the vehicles involved. To clarify the graph, he uses a distinct color for each vehicle and provides an explanatory text, complete with the momentum formulas and all of the variables needed, to solve the problem.


The graphical solutions provide an alternative to formulas in determining pre-impact and post-impact vehicle speeds. They also provide a check on the accuracy of computations that use formulas and enable the crash reconstructionist to gain a clear visual impression of the vector components present in collisions. After a brief introduction, Mr. Kennedy addresses the following topics: Post-Collision Scene Data and Trajectory Analysis Using the Right Hand Coordinate System; Vectors and Vector Analysis; Post Impact Analysis; Pre-Collision Scene Data and Trajectory Analysis; Pre-Collision Side of Equation; Post-Collision Data; and, Trajectory Analysis Using the Left Hand Coordinate System.”

Conservation of linear momentum using vector sum analysis
W. A Kennedy  More Info
Impact velocity from conservation of linear momentum for the traffic accident investigator and reconstructionist: A manual on deriving and using the speed-at-impact ... equations with the 360 degree method
W. A Kennedy  More Info

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