# mathematics

A car braked with a constant deceleration of 45ft/s^2 producing skid marks measuring 55 ft before coming to a stop. How fast was the car traveling when the brakes were first applied? Please round the answer to the nearest hundredth.

Vo= ft/s

Vintial^2 - Vfinal^2= -2*acceleration*distance

Vfinal is zero. deacceleration is negative acceleration in the problem statement

thanks a bunch

1. 👍 0
2. 👎 0
3. 👁 122

## Similar Questions

1. ### calc

a) A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 40 ft/s^2. What is the distance covered before the car comes to a stop? b) A car braked with a constant deceleration of 40

asked by Jill on November 22, 2009
2. ### calculas

A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 105 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?

asked by jordan on December 4, 2011
3. ### calculus

A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 115 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?

asked by Joey on November 16, 2010
4. ### Calculus

At the scene of an accident, there are skid marks which are 200 feet long showing where a car put on the brakes. The driver swears that he was obeying the speed limit. If we assume that the car braked with a constant deceleration

asked by Naomi on April 4, 2017
5. ### VARIATION- ALGEBRA 2

The length of skid marks a car makes when braking varies directly with the square of the speed of the car. If a car traveling 25 mph leaves skid marks 30 ft long, how long would the skid marks be if the car is traveling 40 mph??

asked by Amy on March 5, 2014
6. ### Physics

A car leaves skid marks 72m in length. The deceleration is 7.2m/s^2. What is the speed of the car before braking?

asked by David on January 23, 2015
7. ### Physics

a car leaves skid marks 84 m long on the highway. Assuming a deceleration of 7.50 m/s2, estimate the speed of the car just before braking.

asked by Shay on September 19, 2011
8. ### physics

A car leaves skid marks 90 long on the highway in coming to a stop. Assuming a deceleration of 3.5m/s^2, estimate the speed of the car just before braking.

asked by izzy on July 5, 2011
9. ### Physics

In coming to a stop, a car leaves skid marks 97.0 m long on the highway. Assuming a deceleration of 6.60 m/s2, estimate the speed of the car just before braking. (in m/s)