Find special cases of Vab if velocities are Parallel And Antiparallel.
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This method is not required to solve any particular problem, but it is another way of expressing the relative velocity equation. As a general rule, if the geometry of a problem is simple, then the instantaneous center method will be the easiest to use. However, if the geometry is complex, the the algebraic, relative velocity equations will be the easiest to use.
"Instantaneous Center" of Zero Velocity - a point on (or off) the body that has zero velocity at a specific instant in time
This point generally does not have zero acceleration and will change locations with time.
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