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Magnitude of an Impulse

  1. Dec 18, 2011 #1
    A(n) 0.445 kg football is thrown with a speed
    of 15.1 m/s. A stationary receiver catches the
    ball and brings it to rest in 0.012 s.
    What is the magnitude of the impulse de-
    livered to the ball?
    Answer in units of kg · m/s

    f=m*a
    Δp=m*Δv


    i used f= ma since a= Δv/t
    i got F= .445 kg * 1258.3 ms^-2= 559.94
    BUT THIS IS WRONG. any help would be nice 0,o
    maybe my understanding of an impulse is wrong?
     
  2. jcsd
  3. Dec 18, 2011 #2

    Delphi51

    User Avatar
    Homework Helper

    You found the force. The question asked for impulse. Use impulse = m*Δv or F*Δt
     
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