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Need help for impulse quesion

  1. Jan 9, 2014 #1
    1. The problem statement, all variables and given/known data
    A force that averages 1200N is applied to a 0.4kg steel ball moving at 14m/s in a collision lasting 27ms. If the force is in a direction
    opposite the inital velocity of the ball ,find the final speed and direction of the ball


    2. Relevant equations

    n/a

    3. The attempt at a solution
    I used FdeltaT=mv
    1200(27x10^-3)=0.4(v2-v1)
    32.4=0.4v2-5.6
    38/0.4=v2
    95m/s =V2. Is this correct?
     
  2. jcsd
  3. Jan 9, 2014 #2

    rude man

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    Fdt = Δp is a vector equation.
    You have defined the impulse FΔt as positive, so v1 is negative.
     
  4. Jan 9, 2014 #3
    so it would be 32.4-5.6=26.8
    26.8/0.4=67m/s?
    Is this right?
     
  5. Jan 10, 2014 #4

    rude man

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    Yes it is.
     
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