(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A missile is launched upward with a speed that is half the escape speed. What height (in radii of Earth) will it reach?

a. R/4

b. R/3

c. R/2

d. R

e. 2R

2. Relevant equations

escape speed=√(2GM/r)

3. The attempt at a solution

r is inversely proportional to the square of the speed so if v is now 2v then r will be r/4

the answer key says its supposed to be r/3 :s

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Orbits of Satellites-Proportions and Escape Speed

**Physics Forums | Science Articles, Homework Help, Discussion**