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: Average force

  1. Mar 3, 2010 #1
    1. The problem statement, all variables and given/known data
    Suppose a .146 kg baseball is travelling at 40 m/s.

    a.How much work must be done on the ball to stop it? answer 116.8 J

    b. if it is brought to rest in 2 cm what average force must act on the ball?

    2. Relevant equations
    KE=(1/2)mv^2




    3. The attempt at a solution

    w=Favg(.02m)
    116.8=Favg (.02m)
    Favg=116.8(N/m)/.02(m)

    5840N/1000=5.48 kN
     
    Last edited: Mar 3, 2010
  2. jcsd
  3. Mar 3, 2010 #2

    ehild

    User Avatar
    Homework Helper

    What is your problem?

    ehild
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook