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Homework Help: Volleyball Impulse and momentum problem

  1. Oct 15, 2013 #1
    can someone explain to me how to start on this problem

    A volleyball is spiked so that its incoming velocity of +4.1 m/s is changed to an outgoing velocity of -18 m/s. The mass of the volleyball is 0.44 kg. What impulse does the player apply to the ball?
  2. jcsd
  3. Oct 15, 2013 #2


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    The impulse [itex]J[/itex] is defined as
    [itex]\vec{J}\equiv \int_{t_0}^{t_f}dt' \vec{F}_{net} (t')[/itex]

    From Newton's second law, the impulse is also equal to the change of momentum.

    [itex]\vec{J}=\vec{p}_f -\vec{p}_i =m\vec{v}_f -m\vec{v}_i[/itex]

    If we know [itex]m[/itex],[itex]\vec{v}_f[/itex], and [itex]\vec{v}_i[/itex], we have all the information needed to figure out the impulse.
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