What does the symbol 'Vi' refer to in mechanics?

The symbol 'Vi' in mechanics refers to initial velocity, which is the speed and direction of an object at the starting point of observation. In kinematics, it is a foundational concept, as it allows for the analysis of motion by establishing the starting conditions before any forces, accelerations, or changes in movement take place.

Understanding initial velocity is crucial when solving problems involving motion, such as those involving acceleration, distance traveled, and final velocity. For example, when using equations of motion to predict where an object will be at a certain time, the initial velocity is a key parameter because it influences how the object's position changes over time due to any applied forces or accelerations. This makes 'Vi' an essential aspect of understanding and analyzing dynamic systems in mechanics.