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Homework Help: Calculating Force

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data
    a) A race car has a mass of 718 kg. It starts from rest and travels 44.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?

    b) As a baseball is being caught, its speed goes from 31.0 m/s to 0.0 m/s in about 0.0050 s.
    (First I found out that the baseball's acceleration was -6200).
    What are the magnitude and direction of the force acting on it?
    What are the magnitude and direction of the force acting on the player who caught it


    2. Relevant equations
    a = change in velocity / change in time
    F=ma
    a = net force / mass



    3. The attempt at a solution
    a) i used the constant acceleration formula to find "a", then plugged it into the net force formula. my answer was wrong.

    b) i have absolutely no idea what force is 'acting' on it, or how to approach the solution to the next two requirements. i simply am not a physics person. any or all help dearly appreciated. thank you
     
  2. jcsd
  3. Oct 12, 2009 #2

    rl.bhat

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    Homework Helper

    Show your calculations. We will see where you have made mistakes.
     
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