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Velocity needed to hit a moving target

  1. Feb 7, 2013 #1
    1. The problem statement, all variables and given/known data

    a grizzly bear charges a hunter with a constant velocity of 20m/s at the instant the bear is 150m away from the hunter. The hunter fires an arrow at 25 degrees. What must be the velocity of the arrow to strike the bear?

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 7, 2013 #2

    tiny-tim

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    Welcome to PF!

    Hi Becky26! Welcome to PF! :wink:

    Write out an x,t equation for the bear, and another x,t equation for the arrow.

    You need to find the initial speed so that when x = 150, t is the same for both.

    Show us what you get. :smile:
     
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