physics

A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line, and has a speed of 15.0m/s when it reaches the end of the ramp, which has length 125m .

(a) What is the acceleration of the car?

(b) How much time does it take the car to travel the length of the ramp?

  1. 👍
  2. 👎
  3. 👁
  1. a. V^2 = Vo^2 + 2a*d
    a=(V^2-Vo^2)/2d = (15^2-0)/250=0.9 m/s^2

    b. V = Vo + a*t
    t = (V-Vo)/a = (15-0)/0.9 = 16.67 s.

    1. 👍
    2. 👎
  2. 1515

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    Which statement is correct about the potential energy of a car moving down a ramp? A) Potential energy remains constant because total energy is constant. B) Potential energy depends on the mass and velocity of the car. C)

  2. Physics

    A 1130 kg -car is being pulled up a frictionless ramp at a constant speed. The cable makes an angle of 31.0 degrees above the surface of the ramp, and the ramp itself rises at 25.0∘ above the horizontal. Find the tension in the

  3. Math

    You must scuba dive to the entrance of your room at Jules’ Undersea Lodge in Key Largo, Florida. The diver is 1 foot deeper than 2/3 of the elevation of the entrance. What is the elevation of the entrance?

  4. physics

    A toy car is given a quick push so that it moves on an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. What net force acts on the car?

  1. Physics... URGENT !!!!

    A 66.7-kN car is travelling at 66.5 mph when the driver decides to exit the freeway by going up a ramp. After coasting 418 m along the exit ramp the car\'s speed is 28.9 mph, and it is h = 13.1 m above the freeway. What is the

  2. pre calc

    A ramp leading to a freeway overpass is 470 feet long and rises 32 feet. What is the angle of inclination of the ramp?

  3. physics

    A 600-pound boat sits on a ramp inclined at 30 degrees as shown in the attached image. What force is required to keep the boat from rolling down the ramp? Completely lost, never done physics before....

  4. Grade 10 Math

    A hospital plans to build a wheelchair ramp. It's slope must be less than 1/12 . The entrance to the hospital is 70cm above the ground. What is the minimum horizontal distance needed for the ramp?

  1. Physics

    A 20.0-kg crate sits at rest at the bottom of a 13.5 m -long ramp that is inclined at 40 ∘ above the horizontal. A constant horizontal force of 290 N is applied to the crate to push it up the ramp. While the crate is moving, the

  2. Math

    You must scuba dive to the entrance of your room at Jules' Undersea Lodge in Key Largo, Florida. The diver is 1 foot deeper than 23 of the elevation of the entrance. What is the elevation of the entrance?

  3. physics

    A car is traveling at a constant speed of 27.1 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What

  4. physics

    A 5.84 box sits on a ramp that is inclined at 35.2 above the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.27. What horizontal force is required to move the box up the incline with a constant

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