Homework Help: physics

Posted by kelly on Tuesday, December 1, 2009 at 1:13pm.

A rocket is launched straight up from the earth's surface at a speed of 1.80×104 m/s^2.
a)What is its speed when it is very far away from the earth?

physics - bobpursley, Tuesday, December 1, 2009 at 1:22pm
Energy dictates that some of the KE will go to increasing gravitational PE.

initial KE=finalKE+(GMe/re-GMe/infinity)
initialKE=finalKe+GMe/re

solve for final Ke, then final velocity
physics - kelly, Tuesday, December 1, 2009 at 1:45pm
is Me the mass of the earth?
and re the radius of the earth?

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