Homework Help: college math

Posted by Shin on Thursday, April 28, 2011 at 3:04pm.

Braking distance The braking distance y in feetthat it takes for a car to stop on wet ,level pavement can be estimated by y = 1/9 x^2, where the x is the speed of the car in miles per hour Find the speed associated with with each braking distance.
(a.) 25 feet (b.) 361 (c.) 784

college math - Henry, Friday, April 29, 2011 at 9:22pm
Y = (1/9)(X^2) = X^2/9.

a. Y = X^2/9 = 25 ft.
X^2/9 = 25,
Multiply both sides by 9:
X^2 = 225,
X = 15 Miles/hr.
college math - Henry, Friday, April 29, 2011 at 9:34pm
post it.

Answer this Question

Related Questions

Maths - The braking distance of a car is directly proportional to te square of ...
Algebra II - Word Problem - If a car is traveling downhill at 45 miles per hour ...
Physics - The braking distance of a car is 29m. If the speed of the car is ...
Physics - A 1500 kg automobile travels at a speed of 105 km/h along a straight ...
physics - A 1500 kg automobile travels at a speed of 105 km/h along a straight ...
physics - A car traveling 72.0 km/h along a straight, level road is brought ...
physics - A car traveling 72.0 km/h along a straight, level road is brought ...
College Math - Use the functions to find the stopping distance on wet pavement ...
Physics - A CAR HAS A MASS OF 1200KG TRAVELLING ON A LEVEL ROAD. THE CAR ...
Physics - Proper design of automobile braking systems must account for heat ...

For Further Reading

First Name:
School Subject:
Answer: