Final answer:
The correct formula for the average velocity, given the symbols in the question, is v = (da - di) / (ta - t). This represents the displacement divided by the time interval, fitting the definition of average velocity.
Step-by-step explanation:
The formula for the average velocity, v, of a moving particle, is the displacement divided by elapsed time. The correct equation representing this would be the change in position divided by the change in time. Given the symbols in the question, the right formula is v = (dy - dy) / (ty - tz), where dy and dy are changes in position (displacements) in the y-direction, and ty and tz are the changes in time. However, to match the given options, the equivalent equation should have the variables representing final and initial positions (da and di) and times (ta and t). Therefore, the equation that is equivalent to the average velocity formula is A. v = (da - di) / (ta - t). This equation matches the description of average velocity, with 'da' representing the final position, 'di' representing the initial position, 'ta' the final time, and 't' the initial time. This is consistent with the concept that average velocity = (change in position) / (change in time), which can also be expressed as (final position - initial position) / (final time - initial time).