1. Not finding help here? Sign up for a free 30min 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!

2 object gravitation, collision speed

  1. Apr 13, 2008 #1
    1. The problem statement, all variables and given/known data
    2 objects each with mass, m, and radius, r, are unaffected by any other objects. They are the distance L apart. At time t=0 , both are at rest. From then on they accelerate towards each other.
    Determine the speed of the planets at the moment of collision.

    2. Relevant equations
    From assignment: "Use a= dv/dx * v in order to solve the problem".
    Newtons law of gravitation: Fg= G m^2/(r^2)

    3. The attempt at a solution

    Well I would think that I'm supposed to make 1 or 2 differential equations, which I can then solve specifically by x_0=0 .
    My problem is writing the equations, can anyone help, please?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 13, 2008 #2

    Nabeshin

    User Avatar
    Science Advisor

    I have solved a very similar problem, but am uncertain of the solution! I obtained a position-time equation, from which I could easily differentiate and find velocity... Umm refer to my post in general physics if you want to see that.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: 2 object gravitation, collision speed
Loading...