Velocity and Speed

The average velocity `v_(x,avg)` of an object is defined as the object’s `displacement` `∆x` divided by the time interval `∆t` during which that displacement occurs:
`v_(x,avg)=(∆x)/(∆t)` `a v e r a g e\ v e l o c i ty = (d i s p l a c e m e n t)/(r e q u i r e d\ t i m e)`
The average speed `v_(avg)` of an object, a scalar quantity, is defined as the total distance `d` traveled divided by the total time interval required to travel that distance:
`v_(avg)=d/(∆t)` `a v e r a g e\ s p e e d = (d i s t a n c e\ t r a v e l e d)/(r e q u i r e d\ t i m e)`
From Example 1: Average velocity of the car from A to F: `∆x = -53 m - 30 m = -83 m` `∆t = 50s-0s = 50s` `v_(x,avg)=(∆x)/(∆t)=(-83m)/(50s) = -1.7 m//s` Average speed of the car from A to F: `d_(a->f) = 127 m` `∆t = 50s-0s = 50s` `v_(avg)=d_(a->f)/(∆t)=(127m)/(50s) = 2.5 m//s`