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!

Speed of Separation between 2 masses?

  1. Apr 21, 2010 #1
    1. The problem statement, all variables and given/known data

    Outside the International Space Station, a 60 kg astronaut holding a 4.0 kg object (both initially at rest) throws the object at 10 m/s relative to the space station. A 50 kg astronaut, initially at rest, catches the object. What is the speed of separation of the two astronauts?

    2. Relevant equations

    p = mv
    FΔt = Δp

    Law of Cons. of Momentum
    Pi = Pf

    3. The attempt at a solution

    Pi = Pf
    (4)(10) = (50)(v)
    v = 0.8 m/s

    which is wrong :( not sure how to approach this question, any help please? thank you!
     
  2. jcsd
  3. Apr 21, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    When the astronaut throws the with some velocity, he will recoil. Find the velocity of recoil v of the first astronaut.
    For second astronaut,
    m1v1 = (m1 + m2)v2.
    where m1 is the mass of the object and v1 its velocity. m2 is the mass of the second astronaut and v2 is the combined velocity.
    finally the velocity of separation is (v+v2)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Speed of Separation between 2 masses?
  1. Tension between 2 Masses (Replies: 20)

Loading...