Acceleration Introduction

increasing velocity

decreasing velocity (acceleration is negative)

changing direction

Roadrunner is at 0m/s before we start the stopwatch

At 5 seconds, the new velocity is 10m/s

 $acceleration\ =\ \frac{change\ in\ velocity}{change\ in\ time}$  

 $acceleration\ =\ \frac{10\ \frac{m}{s}}{5s}$  =  $2\ \frac{m}{s^2}$