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Determine the time of impact

  1. Nov 16, 2013 #1
    1. The problem statement, all variables and given/known data
    A ball of mass 50g is thrown horizontally against a wall such that it strikes it
    at a velocity of 12ms-1. If it exerts a force of 3N on the wall, determine the
    time of impact.


    2. Relevant equations



    3. The attempt at a solution

    I drew the diagram and made the direction and wrote the values neatly on my paper as it's sort of a must to do this and it makes me understands the work better. Does the 50g needs to be changed and converted into kg?
     
  2. jcsd
  3. Nov 16, 2013 #2
    is the collision elastic??
     
  4. Nov 16, 2013 #3
    as we know
    dp=F.dt
    and hence you could find the answer
     
  5. Nov 16, 2013 #4


    yes it is needed to....!!!!!!
     
  6. Nov 16, 2013 #5
    I got totally confused! that's the full question. So is it 0.2s?
     
  7. Nov 16, 2013 #6
    i think the question is some how incomplete..... please look and write all the information given in the question......!!!!!!!!!!
     
  8. Nov 16, 2013 #7
    That's the full question! maybe there's a trick in it? not sure, otherwise there's another value which could be taken as 0?
     
  9. Nov 16, 2013 #8
    then it will be . change in momentum = Δp = p(initial)-p(final)
    assume the ball is movin along +ve x direction
    then
    Δp = p-(-p)= 2p
    an hence pu it in the above equation
     
  10. Nov 16, 2013 #9
    click thanks on it.....:)
     
  11. Nov 16, 2013 #10
    Sure! :) I'm new to this, and I'm figuring this forum out! and thanks for your help too
     
  12. Nov 16, 2013 #11
    he he he ok......!!!!!
     
  13. Nov 16, 2013 #12

    haruspex

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    you don't need to know. Change in momentum = ∫F.dt.
     
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