Question

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

Answer 1

Answer:

38 m/s

Step-by-step explanation:

We are given that

D represent Rachel's remaining distance( in meters ) as  a function of time is given by

$D=-38t+220$

We have to find the Rachel's speed.

We know that

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

Substitute the values then we get

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

$Speed =\mid v\mid$

$Speed =\mid -38\mid =38m/s$

Hence, the Rachel's speed is given by =38 m/s