science

posted by .

Moving at 20m/s a carr of mass 2000kg applies its brakes and comes to rest over a distance of 10m. Find the size of the net force that acted to stop the car.

would I find t using t=dv. then would I use that for F=(m*v)/t ?

The speed doesn't stay constant, so that won't work. The simplest way to solve the problem is to use that the work done by the force must equal the kinetic energy. So:

F*d = 1/2 m v^2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Science

    Moving at 20 m/s , a remote controlled car of mass 1000kg hits a pile of sand and comes to rest in 10 s. Find the average force that acted to stop the car. The same car now hits a wall and comes to rest in 1s. Find the average force …
  2. Physics

    Moving at 20 m/s , a remote controlled car of mass 1000kg hits a pile of sand and comes to rest in 10 s. Find the average force that acted to stop the car. The same car now hits a wall and comes to rest in 1s. Find the average force …
  3. college Physics

    A car is traveling at 7.0 m/s when the driver applies the brakes. the car move 1.5m before it comes toa complete stop. if the car had been moving at 14m/s how far would it have continued to move after the brakes were applied?
  4. College Physics

    The driver of a 1600 kg car, initially traveling at 10.6 m/s, applies the brakes, bringing the car to rest in a distance of 23.0 m. (a) Find the net work done on the car. (b) Find the magnitude and direction of the force that does …
  5. More Physics

    I have NO idea how to do this! any help is great! A car with a mass of 1330kg is traveling at 28m/s. The driver applies the brakes to bring the car to a rest over a distance of 79m. Calculate the retarding force acting on the car. …
  6. Physics

    A motor car of mass 30kg,moving with a velocity of 10m/s. by the application of brakes,it was brought to rest at a distance of 25meters. Find the average force.
  7. Physics

    I was wondering if my answers are correct. 1. A 50kg person is taking a ride on an elevator travelling up at a steady speed of 2.5m/s. Find the time fo the elevator trip if the elevator does 4900 J of work on the person. My answer: …
  8. Physics

    A driver in a car, originally moving at 13.1 m/s, applies the brakes until the car comes to a stop. The car moves a distance of 34.1 m while braking. How much time did it take for the car to stop?
  9. Physics

    A car of mass 1000 kg moving with a velocity of 30m/s applies break and stop after 3s. Find the magnitude of retarding force, the distance travelled by the car before it came to rest and the work done by the breaking force.
  10. physics

    A motor car of mass 30kg,moving with a velocity of 10m/s. by the application of brakes,it was brought to rest at a distance of 25meters. Find the average force.

More Similar Questions