Displacement(Δr→ = rf→ -ri→)

Average Speed(v)

$$ Vav = Δr/Δt $$

Average Velocity(v→)

$$ Vav → = Δr→/Δt→ = (rf→ - ri→)/(tf - ti) $$

Average Speed is great or equal to the Average Velocity

$$ Vav≥ |Vav→| $$

Instantaneous speed and velocity

$$ V = lim∆→0 (∆r/∆t) $$

$$ V → =lim∆t→0(∆r→/∆t) $$

Instantaneous speed is equal to the Instantaneous velocity

$$ V= |V→| $$

Average acceleration(av→)