Tarzan is once again swinging on his vine while Jane times him. At time = 4 seconds, Tarzan is at one end of
his swing and 30 feet from the riverbank swinging over
land. When Tarzan is swinging over land, graphically
those distances will be positive numbers. At time = 9
seconds, Tarzan is at the other end of his swing and 42
feet from the riverbank swinging over water. When
Tarzan is swinging over water, graphically those
distances will be negative numbers.