Posted by **Laramie** on Friday, March 26, 2010 at 9:52am.

You are on Pluto and would like to send a probe into space so that it does not fall back to the surface. What minimum launch speed do you need? (The mass of Pluto is 1.3x^22 kg and the radius of Pluto is 1.18x10^6 m).

Answer in km/s.

I have used the velocity of escape = (square root of) 2(g)(m1)(m2)/r but keep getting the wrong answer.

1.21e5 km/s and 4.7e3 km/s are two of the answers I've been getting. Help?

- physics: escape velocity -
**bobpursley**, Friday, March 26, 2010 at 10:22am
PE at surface=KE at launch

GMp/radius = 1/2 v^2

v= sqrt(2GMp/r) where G is 6.67E-11

v=sqrt(2*6.67E-11*1.3E22)/1.18E6)

You seem to have difficulty operating your calculator. Put this into the Google search window:

sqrt(2*6.67E-11*1.3E22/1.18E6)

- physics: escape velocity -
**Laramie**, Friday, March 26, 2010 at 11:33am
Hmm. I wonder how I can correct my poor usage. Thank you very much!

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