Question

Rachel is a stunt driver, and she's escaping from a building that is about to explode! D(t) models Rachel's remaining distance (in meters) as a function of time t (in seconds). D(t)=−38t+220. What is Rachel's speed?

Answer 1

38 m/ s

Explanation:

We are given that Rachel is a stunt driver , and she escaping from a building .

D(t) models Rachel's remaining distance ( in meters) a s function of times t ( in seconds)

D(t)=-38 t+220

We have to find the speed of Rachel's

We know that speed is a absolute value of velocity

We are finding velocity

`v=(ds)/(dt)`

`v=(d(-38t+220))/(dt)`

`v=-38 m/s`

Speed=38 m/s

Hence, speed of Rachel's=38 m/s

Answer 2

38 m/s

Explanation:

The formula tells you Rachael's distance to the exit decreases by 38 m for each passing second. Her speed is 38 m/s.