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: Determining impulse on baseball from bat given velocity change

  1. Mar 25, 2010 #1
    1. The problem statement, all variables and given/known data
    A(n) 0.182 kg baseball is thrown with a speed of 15.3 m/s. It is hit straight back at the
    pitcher with a final speed of 10.4 m/s. What is the magnitude of the impulse delivered to the ball?

    2. Relevant equations
    impulse=mass*change of velocity

    3. The attempt at a solution
    .182*-4.9(change in velocity)=-.8918 answer is wrong is it the sign
  2. jcsd
  3. Mar 25, 2010 #2

    Filip Larsen

    User Avatar
    Gold Member

    Re: impulse

    It is a sign problem, yes. Select a direction and write speeds in that direction as positive numbers and speeds in the opposite direction as negative numbers and try again (hint: the change in velocity is not 4.9 m/s but 25.7 m/s).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook