Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Which car has the greater deceleration rate?

  1. Sep 4, 2010 #1
    1. The problem statement, all variables and given/known data
    A 2500 kg truck collides into a 1250 kg car. Both cars were traveling the same speed in opposite directions. Which car has the greater deceleration rate?

    2500 kg truck
    1250 kg car
    the same deceleration

    2. Relevant equations


    3. The attempt at a solution

    i chose the same because a=v/t, and i thought theyd have the same delta v
  2. jcsd
  3. Sep 4, 2010 #2

    Filip Larsen

    User Avatar
    Gold Member

    Re: Momentum/Impulse

    Welcome to PF!

    Assuming the cars stick together in the collision do you then know in which direction the combined wrecks travel right after collision? (hint: use momentum). From this information can you then conclude which car experience the greatest change in velocity and if this also corresponds to the greatest average deceleration? (hint: duration of collision is same for both cars, so greatest change in velocity equals greatest average deceleration).
  4. Sep 4, 2010 #3
    Re: Momentum/Impulse

    the cars would probably travel in the direction of the truck, so the smaller car would have the greater change in velocity.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook