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Homework Help: Help Relative Velocity

  1. Oct 4, 2016 #1
    1. The problem statement, all variables and given/known data
    A person on a train watches a car approaching a railway crossing ahead on his track. It appears that the car’s driver has fallen asleep and will not slow down. The train is traveling north‐east at 100km/h while the car is going west at 80km/h. The train is 4 km and the car is 3km from the crossing. I) What is the velocity of the car relative to the train. Pick the train travel direction (North‐ East) as the +x direction and the perpendicular direction (North‐west) as the +y direction II) Where will the train be when the car gets to the crossing, will they collide? III) Find the acceleration of the car required to cause a collision. IV) In the reference frame of the train rider, what is the acceleration.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 4, 2016 #2


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    Hi kid, :welcome:

    Is there a question here ? PF has a specific culture (read the guidelines) asking something from you ...
  4. Oct 4, 2016 #3
    could u solve it
  5. Oct 4, 2016 #4


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    In order to get help you need to show your best attempt to solve the problem and explain where you get stuck. We can just do the problem for you.
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