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

Answer:

38 m/s

Step-by-step 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.

Answer 2

Answer:

38 m/ s

Step-by-step 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

$v=\frac{ds}{dt}$

$v=\frac{d(-38t+220)}{dt}$

$v=-38 m/s$

Speed=38 m/s

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