Results 1 to 2 of 2

Math Help - Final Momentum

  1. #1
    TGS
    TGS is offline
    Junior Member
    Joined
    Jun 2009
    Posts
    27

    Final Momentum

    You and a friend each hold a lump of wet clay. Each lump has a mass of 20 grams. You each toss your lump of clay into the air, where the lumps collide and stick together. Just before the impact, the velocity of one lump was < 5, 4, -3 > m/s, and the velocity of the other lump was < -2, 0, -6 > m/s.

    What is the momentum of the stuck-together lump just after the collision?

    What I did first was take the total mass of the two lumps and multiplied it to the sum of their velocities.... Can someone please explain to me what I did wrong??
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,114
    Thanks
    992
    Quote Originally Posted by TGS View Post
    You and a friend each hold a lump of wet clay. Each lump has a mass of 20 grams. You each toss your lump of clay into the air, where the lumps collide and stick together. Just before the impact, the velocity of one lump was < 5, 4, -3 > m/s, and the velocity of the other lump was < -2, 0, -6 > m/s.

    What is the momentum of the stuck-together lump just after the collision?
    in each direction ...

    m_1v_{1o} + m_2v_{2o} = (m_1+m_2)v_f

    in the x-direction ...

    20(5) + 20(-2) = 40v_{fx}<br />

    v_{fx} = 1.5 m/s

    do the same in the y and z direction
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Momentum
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: May 19th 2009, 11:59 PM
  2. momentum
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: December 9th 2008, 03:57 AM
  3. momentum
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: May 2nd 2008, 02:57 PM
  4. Momentum
    Posted in the Advanced Applied Math Forum
    Replies: 3
    Last Post: April 8th 2008, 03:38 AM
  5. Momentum
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: October 27th 2007, 03:50 PM

Search Tags


/mathhelpforum @mathhelpforum