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Homework Help: What is the average force on the wall?

  1. Feb 7, 2015 #1
    1. The problem statement, all variables and given/known data
    A ball hits the wall in a normal direction with v=10m/s. After the hit which lasted 0.2 Seconds, it turned in the same direction with v=10m/S. Knowing that its mass is 0.5 kg, find the average force that hit the wall.

    2. Relevant equations
    F=m*a, a= (v-v0)/t

    3. The attempt at a solution
    a=(0-10)/0.2=-50m/S2, F= 50*0.5= 25N, but the answer is 50N
  2. jcsd
  3. Feb 7, 2015 #2


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    Science Advisor

    What is the final velocity minus the initial velocity? Your calculation assumes the final is zero....
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