Question

Rachel is a stunt driver, and she's escaping from a building that is about to explode!

The variable d models Rachel's distance from her exit (In meters) t seconds after the cameras began recording the stunt

What is Rachel's speed?​

Answer 1

38 meters per second

Explanation:

Hope this helps!

Answer 2

The variable d models Rachel's distance from her exit (in meters) t seconds after the cameras began recording the stunt. d = - 38t

Explanation:

From given, we have, The expression that represents the Rachel's distance is given by, d = - 38t + 220

where, d represents the distance in meters

t represents the time in seconds

We know that, speed = distance by time. Therefore, we need to differentiate the given equation w.r.t to time to find the speed.

we have, d/dt (d) = d/dt [- 38t + 220]

| d/dt (d) | = | - 38 + 0 |

s = d/dt (d) = 38 m/s

Therefore, the speed of Rachel is 38 m/s.