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: Collision and conservation of P

  1. Dec 2, 2007 #1
    1. The problem statement, all variables and given/known data
    A ball (A) is rolling west at 3m/s and has a mass of 1kg. Another ball (B) has a mass of 2kg and is stationary. After a collision, ball A moves south at 2 m/s. Calculate the momentum and velocity of ball B after the collision.

    2. Relevant equations
    P=m x v

    3. The attempt at a solution
    Pa(initial)=1kg(3m/s W)= 3kgm/s W
    Pa(final)=1kg(2m/s S)= 2kgm/s S
    a vector diagram gives me a right triangle. Pythagoras gives me c=Pb(final) as 3.6kgm/s
    33.7 degrees North of West.
    Pb=m x v
    3.6kgm/s 33.7degrees north of west /2 kg= vb
    vb= 1.8 m/s 33.7 degrees north of west.
    Is this correct?
  2. jcsd
  3. Dec 5, 2007 #2

    Shooting Star

    User Avatar
    Homework Helper

  4. Dec 5, 2007 #3
    Thank you
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook