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Impulse imparted by the ground on the ball?

  1. Jul 10, 2011 #1
    1. The problem statement, all variables and given/known data
    A mass 100.0 g is dropped from some height above the ground and rebounds to a point where it has 78% of its initial gravitational potential energy. As it hits the ground, it is moving at 1.2 m/s. What is the impulse imparted by the ground on the ball?


    2. Relevant equations
    impulse = m(vf-vi)


    3. The attempt at a solution
    impulse = (0.1)(1.2 m/s - 0 m/s)
    =0.12 kg m/s

    I followed the formula for impulse, but i feel like I did it wrong because there was a lot more information given in the problem that I didn't use in my solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 10, 2011 #2
    I think you need to take into account the ball's velocity after colliding with the ground.
    Also you're saying vf = 1.2m/s but the problem states that vi = 1.2m/s.
    To find vf you need to use the information about the gravitational potential energy.
     
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