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Force and Energy Question

  1. Sep 25, 2014 #1
    1. The problem statement, all variables and given/known data

    "You are investigating an accident where a 1500 kg car rolls down a hill with a slope of 8 degrees, a distance of 150 m (measured along the road) and hit a parked van. How fast was the car moving when it hit the van, assuming little friction?"

    2. Relevant equations

    If I knew all of the equations, I would have most likely figured out the problem.
    Force= mass x acceleration
    K-work=velocity x impulse
    K-work= Force x distance

    3. The attempt at a solution

    Now what I did so far was calculated the force of gravity pushing down on the car which is mass x gravity acceleration constant which I ended up getting 14,700 N. I then figured out using the 8 degrees and the force I just calculated, the force of the hypotenuse of the right angle I created. When I figured that all out I got some huge acceleration. Can someone please help me with this? I feel like it's so simple.
  2. jcsd
  3. Sep 25, 2014 #2

    Doc Al

    User Avatar

    Staff: Mentor


    Show exactly what you did.

    If the car fell off a cliff, the most its acceleration could be is equal to g. When it rolls down an incline, the acceleration will be less. So if you got a huge acceleration, you must have made a mistake somewhere.
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