Question

Alex Rode her skateboard her velocity changed from 3m/s to 1m/s in 4 seconds. What was her acceleration?

Answer 1

You can use the acceleration formula: 

$a = \frac{\Delta v}{\Delta t}$
$a = \frac{1 - 3 }{4 - 0}$
$a = \frac{-2 }{4}$
$a = -\frac{1 }{2} = -0.5$