![](../../../image/cycpywrt.gif)
An airplane buzzes an airfield. Its distance from the ground at various times (measured from the start of its maneuver) are: [400 feet at 2 seconds ],
[200 feet at 4 seconds], [50 feet at 6 seconds],
[ 25 feet at 7 seconds], [ 50 feet at 8 seconds].
The best approximation to the instantaneous rate of change of the distance from the ground at 5 seconds from the start of the maneuver is given by
(A) (50-400)/(8-2) ft/s.
(B) (50-400)/(6-2) ft/s.
(C) (25-200)/(7-4) ft/s.
(D) (50-200)/(6-4) ft/s.
(E) (50-200)/(8-4) ft/s.
![](../../../image/cycpywrt.gif)
An airplane buzzes an airfield. Its distance from the ground at various times (measured from the start of its maneuver) are:
[400 feet at 2 seconds ], [200 feet at 4 seconds], [50 feet at 6 seconds], [25 feet at 7 seconds], [50 feet at 8 seconds].
The best approximation to the instantaneous rate of change of the distance from the ground at 5 seconds from the start of the maneuver is given by
(A) (50-400)/(8-2) ft/s. No.
That time interval is too long.
![](../../../image/cycpywrt.gif)
An airplane buzzes an airfield. Its distance from the ground at various times (measured from the start of its maneuver) are:
[400 feet at 2 seconds ], [200 feet at 4 seconds], [50 feet at 6 seconds], [25 feet at 7 seconds], [50 feet at 8 seconds].
The best approximation to the instantaneous rate of change of the distance from the ground at 5 seconds from the start of the maneuver is given by
(B) (50-400)/(6-2) ft/s. No.
A shorter time interval is available.
![](../../../image/cycpywrt.gif)
An airplane buzzes an airfield. Its distance from the ground at various times (measured from the start of its maneuver) are:
[400 feet at 2 seconds ], [200 feet at 4 seconds], [50 feet at 6 seconds], [25 feet at 7 seconds], [50 feet at 8 seconds].
The best approximation to the instantaneous rate of change of the distance from the ground at 5 seconds from the start of the maneuver is given by
(C) (25-200)/(7-4) ft/s. No. That is not
the shortest available time interval containing 5s.
![](../../../image/cycpywrt.gif)
An airplane buzzes an airfield. Its distance from the ground at various times (measured from the start of its maneuver) are:
[400 feet at 2 seconds ], [200 feet at 4 seconds], [50 feet at 6 seconds], [25 feet at 7 seconds], [50 feet at 8 seconds].
The best approximation to the instantaneous rate of change of the distance from the ground at 5 seconds from the start of the maneuver is given by
(D) (50-200)/(6-4) ft/s. Yes. That is the average rate
for the shortest available time interval containing 5s.
![](../../../image/cycpywrt.gif)
An airplane buzzes an airfield. Its distance from the ground at various times (measured from the start of its maneuver) are:
[400 feet at 2 seconds ], [200 feet at 4 seconds], [50 feet at 6 seconds], [25 feet at 7 seconds], [50 feet at 8 seconds].
The best approximation to the instantaneous rate of change of the distance from the ground at 5 seconds from the start of the maneuver is given by
(E) (50-200)/(8-4) No. That is not the shortest
available time interval containing 5s.