SOLUTION: the distance d, in feet required for a vehicle traveling at r mi/h to come to a stop is given approximately by d=0.05r^2 + r. If an automobile in a 55 mi/h speed zone is required 2
Algebra.Com
Question 1004984: the distance d, in feet required for a vehicle traveling at r mi/h to come to a stop is given approximately by d=0.05r^2 + r. If an automobile in a 55 mi/h speed zone is required 240 feet to stop, was its speed within the legal limit?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the distance d, in feet required for a vehicle traveling at r mi/h to come to a stop is given approximately by d=0.05r^2 + r.
---------------------------------------------------
If an automobile in a 55 mi/h speed zone is required 240 feet to stop, was its speed within the legal limit?
---------------------
Solve for "r"::
0.05r^2 + r - 240 = 0
-------
Use the Quadratic Formula to get::
r = [-1 +- sqrt(1-4*0.05*-240)]/(2*0.05)
-----
r = [-1 +- 7]/0.1
-----
Acceptable answer::
r = [6/0.1] = 60 mph
----
Answer: No
--------
Cheers,
Stan H.
------------
RELATED QUESTIONS
For a certain model of car the distance d required to stop the vehicle if it is traveling (answered by math_tutor2020)
Hi. May I have some help with the following problem?
For a certain model of car the... (answered by checkley71,solver91311)
The distance D in feet it takes a car traveling at x mph to come to a full stop after... (answered by Cromlix)
Can you please help me?
For problems 14 through 16, the equation {{{ d=.05r^2+r... (answered by feliz1965)
5. When the driver of a vehicle observes an obstacle in the road, the total stopping... (answered by math_tutor2020)
A model for the braking distance, d feet, required to stop a certain car when it is... (answered by ankor@dixie-net.com)
PHYSICS—ENGINEERING For a car traveling at a speed of v miles per hour, under the best... (answered by TimothyLamb)
The stopping distance (D) of a vehicle varies directly as the square of its velocity (V). (answered by sachi,MathTherapy)
Corbin was driving his car at a speed of r miles per hour, when he had to stop suddenly.... (answered by ankor@dixie-net.com)