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Homework Help: Force and Mass problem

  1. Oct 11, 2007 #1
    1. The problem statement, all variables and given/known data
    A 7000. kg plane is launched from a aicraft carrier in 2.0 sec. by a force of 350,000 N.

    a) What is the plane's acceleration?
    b)What is the plane's velocity after the two seconds?

    2. Relevant equations
    A=f/m => A=350,000/7000 = 50 m/s2

    3. The attempt at a solution

    The main question is: How am I supposed to find the velocity if they dont give me the distance? and how do I find the distance if I still not knowing the velocity?

    *I figured that a Aircraft Carrier is 500m (distance) then I made the formula for velocity, but I dont know if I am doing the right way*
    (final result were v=200 m/s)
  2. jcsd
  3. Oct 11, 2007 #2


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    Science Advisor
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    Gold Member

    you don't need to know the distance, you can get the velocity from another kinematic equation that relates velocity with acceleartion and time. You didn't do it right, you should show how you arrived at that v=200m/s figure or d =500m value, both of which are not correct.
  4. Oct 12, 2007 #3
    I think another relevant equation is missing and that is:


    where a is acceleration
    vf is final velocity (in this case the velocity after the time allotted)
    vi is initial velocity
    t is time
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