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: Gravitational Problem

  1. Dec 8, 2009 #1
    1. The problem statement, all variables and given/known data

    A rocket is launched straight up from earth surface at 15000 m/s speed. What is the speed of the rocket when its very far away from the earth?

    2. Relevant equations

    3. The attempt at a solution

    Escape speed from earth is 11200m/s. So I am guessing the rocket's speed when its "very far" away from earth is 3800m/s?
  2. jcsd
  3. Dec 8, 2009 #2


    User Avatar
    Homework Helper

    Nice try, but no, that's not the answer. This problem is not quite that simple.

    Think about this: how do you calculate the escape velocity, 11200 m/s? That should give you a clue as to how to proceed with this problem.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook