A driver traveling at 25 mph in a school zone can brake to an emergency stop in 8 ft. Under similar conditions, what would be the braking distance if the car were traveling at 40 mph?

  1. 👍 0
  2. 👎 0
  3. 👁 172
  1. The braking distance is proportional to the kinetic energy, which means it is proportional to the square of the velocity.

    So, multiply 8 ft by (40/25)^2.
    You should get about 20.5 ft.

    There will be an additional distance travelled while the driver responds to the emergency and applies the brake. That distance is proportional to speed, but they probably expect you to ignore it.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Please help with drivers education

    1. When you must handle several hazards at the same time, the best tactic is to (1 point) compromise the hazards. adjust speed to separate the hazards. minimize, then separate the hazards. minimize, then compromise the hazards. 2.

    asked by Anonymous on March 30, 2016
  2. math

    The stopping distance d of a car after the brakes have been applied varies directly as the square of the speed r. If a car traveling 40 mph can stop in 100 ​ft, how fast can a car travel and still stop in 256 ​ft?

    asked by tevita on February 21, 2016
  3. Physics

    A driver traveling at 50mph is 80m from a wall ahead. If the driver applies the brake immediately at a reaction time of 2 seconds and begins slowing the vehicle at 10m/s2. a. Find the distance from the stopping point to the wall.

    asked by Abdikafi on July 3, 2020
  4. please help! physics

    A 1200 kg car is moving at 95 km/h when the driver notices a deer down the road. He immediately moves his foot toward the brake pedal, taking only 0.50 seconds before the car starts slowing down. The brakes cause a net force of

    asked by Caroline on October 21, 2014
  5. physics

    When a driver presses the brake pedal, his car stops with an acceleration of -8.7 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 10 m/s?

    asked by Jojo on June 11, 2015
  1. physics

    A typical car under hard braking loses speed at a rate of about 6 m/s2. The typical reaction time to engage the brakes is 0.50 s. A local school board sets the speed limit in a school zone such that all cars should be able to stop

    asked by Nidhi on January 30, 2017
  2. Physics

    When a driver brakes an automobile, the friction between the brake drums and the brake shoes converts the car's kinetic energy to thermal energy. If a 1750-kg automobile traveling at 28 m/s comes to a halt, how much does the

    asked by please help on November 26, 2012
  3. Physics

    The speed limit in a school zone is 40km/h. A driver traveling at this speed sees a child run into the road 13m ahead of his car. He applies the breaks, and the car decelerates at uniform rate of 0.8m/s². If the driver's reaction

    asked by Majiri on February 2, 2018
  4. physics

    The "reaction time" of the average automobile driver is about 0.700 s. (The reaction time is the interval between the perception of a signal to stop and the application of the brakes.) If an automobile can slow down with an

    asked by mely on January 20, 2011
  5. math

    The stopping distance (s) of a car varies directly as the square of its speed (v). If a car traveling at 50 mph requires 170 ft to stop, find the stopping distance for a car traveling at v2 = 55 mph.

    asked by Irma on November 17, 2014
  6. Physics Part A HELP!!

    4.) In coming to a stop, a car leaves skid marks 80m long on the highway. Assuming a DEceleration of 7.00 m/s^2 (m/s/s), estimate the speed of the car just before breaking. 6.) A car traveling @ 90km/h strikes a tree. The front

    asked by Jess on December 14, 2015

You can view more similar questions or ask a new question.