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Please help algebra-based acceleration of gravity

  1. Oct 15, 2009 #1
    1. The problem statement, all variables and given/known data
    A ball with a mass of 2kg is trown off a cliff 30m high and hits the ground with a momentum of 110 kg*m/s^2. What is the acceleration of gravity pulling on the ball?


    2. Relevant equations
    F=ma and I'm not sure what else.


    3. The attempt at a solution
    I probably messed up.
    a=F/m
    a=110N/2kg
    a=55m/s^2
     
  2. jcsd
  3. Oct 16, 2009 #2

    Suy

    User Avatar

    Momentum is not equal to force
    p=mv, use this equation to solve it
    where p(momentum) is N·s
     
  4. Oct 16, 2009 #3
    You don't need F=ma.

    As Suy said, use p=mv. That'll give you velocity; then just use your basic kinematics equations to find a.
     
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