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. d = -38t + 220. whats rachels speed? meters per second

38 m/s

Step-by-step explanation:

Velocity is the rate of change of distance with time.

.. dd/dt = -38 . . . . meters per second

Speed is the magnitude of velocity.

... |-38| = 38 . . . . meters per second

Comment on Rachel's distance

Since the distance is decreasing with time, we have to assume that it is measured inside the building, and that negative distance means distance outside the building.

38 meter per second

Step-by-step explanation:

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

where -38 is the rate of change of function .

Since speed is the rate of change of position with respect to time , thus

Speed =-38 meter per second which shows decrease in distance with respect to time.

At t=0 second, d=220 meters

At t=1 second , meters

Distance traveled in 1 second = 220-182=38

Now, Rachel's speed=

Rachel's speed==38 meter per second

38 METERS PER SECOND

Step-by-step explanation:

Hope thIs HeLpS

I dont know the answer I'm not good at math

Given:

The variable d models Rachel's distance from her exit (in meters) t seconds after the cameras began recording the stunt. d = - 38t + 220

To find:

What is Rachel's speed?

Solution:

From given, we have,

The expression that represents the Richel'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.

Hence, 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.

Given:

The variable d models Rachel's distance from her exit (in meters) t seconds after the cameras began recording the stunt. d = - 38t + 220

To find:

What is Rachel's speed?

Solution:

From given, we have,

The expression that represents the Richel'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.

Hence, 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.

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