# A skateboarder descends on a ramp from 172 feet to 67 feet in 15 seconds. What is the average change in height per second?

Nov 8, 2015

$- 7 \text{ft/s}$

#### Explanation:

To get this we divide the change in height by the time taken:

$= \frac{67 - 172}{15} = - 7 \text{ft/s}$