Example 1:^[1] A particle starting at the origin has moved 27 m in 9 s. Find ${\displaystyle {\bar {v}}}$.

${\displaystyle {\bar {v}}={\frac {x_{f}-x_{i}}{t_{f}-t_{i}}}={\frac {27\ \mathrm {m} -0\ \mathrm {m} }{9\ \mathrm {s} -0\ \mathrm {s} }}=3\ \mathrm {m} /\mathrm {s} }$

Example 2: A particle starting 23 m from the origin has moved to 43 m in 5 s. Find ${\displaystyle {\bar {v}}}$.

${\displaystyle {\bar {v}}={\frac {x_{f}-x_{i}}{t_{f}-t_{i}}}={\frac {43\ \mathrm {m} -23\ \mathrm {m} }{5\ \mathrm {s} -0\ \mathrm {s} }}={\frac {20\ \mathrm {m} }{5\ \mathrm {s} }}=4\ \mathrm {m} /\mathrm {s} }$

reference

1. ↑ This and others below are from https://en.wikipedia.org/w/index.php?title=Equations_of_motion&oldid=579071246