Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Need help w/Speed of a Slingshot problem

  1. Feb 5, 2007 #1
    1. The problem statement, all variables and given/known data

    Question: To find the speed of a ball bearing launched from a wrist rocket (sling-shot) you take aim at a 55 gallon steel drum exactly 78 meters from you. You hear the "clunk" of impact 0.7 seconds after you "let fly." If the speed of sound on that particular day is 330 m/s, how fast must the ball bearing be traveling?
  2. jcsd
  3. Feb 6, 2007 #2


    User Avatar
    Homework Helper

    The path of the ball bearing will be parabolic, but if we assume that it was shot horizontally we have that the launching speed [tex]v_o[/tex] will be exactly equal to the x-velocity component, [tex]v_x[/tex], of the ball bearing.
    So if you can calculate [tex]v_x[/tex] you have your answer.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook