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Homework Help: Net force

  1. Nov 16, 2007 #1
    An aircraft carriers capapult accelerates a 2000-kg jet aircraft from rst to a lauch speed of 320m/s in 2.0s.

    a) The net force on the plane is ?
    b) the lenght of the catapult is ?

    F= m/a Lenght= at^2/2 vf=vo*at

    320m/s= (0) * a * 2.0s
    a= 160 m/s

    F= 2000kg * 160m/s
    = 320,000 N

    b at^2/2 160*4/2= 320M

    Is this right








    3. The attempt at a solution
     
  2. jcsd
  3. Nov 17, 2007 #2

    Shooting Star

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    Homework Helper

    "F= m/a Lenght= at^2/2 vf=vo*at " ? NOT right.

    F=ma.
    vf=v0+at.
     
  4. Nov 17, 2007 #3
    Your solution is correct.
     
  5. Nov 17, 2007 #4
    ok yeah, I meant to put the + sign instead of *.
     
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