This applet simulates a simple two dimensional collision between two objects of equal mass. After the applet loads, two balls will appear, a red one and a blue one. The blue one is the "target". Drag the red ball up or down to establish the impact parameter, b. Then type an initial velocity between 0 and 100 in the "Vxi" field for the red ball. Finally press the "Go" button to begin the simulation. When the simulation is done, press "Reset" to try a new one. Press "Stop" at any time to pause the simulation. Press "Go" to continue.