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Homework Help: Bouncing Ball

  1. Feb 18, 2010 #1
    1. The problem statement, all variables and given/known data

    a rubber ball mass of 0.08 kg bounces vertically on a concrete floor. the ball strikes the floor at 10 ms-1 and rebounds at 8 ms-1. The time in contact with the floor is 0.05 sec.
    Calculate the average net force acting on the ball during the contact with the floor.

    2. Relevant equations
    E=F/t

    F=0.5mv^2

    3. The attempt at a solution

    (0.5x0.08x10^2)/0.05
    = 80N

    I get a force of 80 N but to me it seems to much to be true... Help???
     
  2. jcsd
  3. Feb 18, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    You have to find the average force which is found by
    F= (change in momentum)/time.
     
  4. Feb 18, 2010 #3
    So change in momentum= 1.44 kgms-1

    F=1.44/0.05
    =28.8N

    that seems more plausible Thanks for the help!!!
     
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