1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Work of a pitcher on the ball

  1. Nov 1, 2006 #1
    A baseball leaves a pitcher's hand at a speed of 41.0 m/s. The mass of the baseball is 0.142 kg . Ignore air resistance. How much work has the pitcher done on the ball in throwing it?

    I've tried using (1/2)mv^2, but there has got to be something weird going on, or i could just be using the wrong equation

    thanks for any and all help :smile:
  2. jcsd
  3. Nov 1, 2006 #2

    i work it out and get the same thing every time i have tried it.
    2.911 Joules is the answer I get, and WebAssign says that it is incorrect.
  4. Nov 1, 2006 #3

    Doc Al

    User Avatar

    Staff: Mentor

    How are you getting that answer? Show what you did.
  5. Nov 1, 2006 #4

    Sorry about not showing all the work.

    I just take the givens: v=41.0 m/s m=0.142 kg

    Then I plug it in to: [tex] \frac{m*v^2}{2} [/tex]

    [tex] \frac{41*0.142}{2} [/tex]

    That is the answer i come up with (2.911 Joules)
  6. Nov 1, 2006 #5


    User Avatar

    square your 41, boy!
  7. Nov 1, 2006 #6
    duh. thanks i knew i was doing something completely dumb.
    always gotta forget the easy part.

    right answer = 119.351 Joules

    thanks a lot
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook