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Homework Help: Momentum problem

  1. Oct 21, 2008 #1
    A .3 kg ball is dropped from a height of 2 m. It strikes the group and rebounds to a height of 1.5 m. The collision with the ground lasts for .01 seconds. The average force exerted by the ground on the ball is:

    a)280
    b) 540
    c) 430
    d) 350

    So, i know that we have to use some type of formula involving mgh which equals velocity?

    I did:

    .3 [ rad 2mgh +rad 2 mgh] / .01 = 350

    is this correct?
     
  2. jcsd
  3. Oct 21, 2008 #2
    yes - from whence came your equation?
     
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