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

38

Explanation:

Answer 2

38 m/s

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=(ds)/(dt)`

Substitute the values then we get

`v=(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