What is the mass of a kerbal?

[MatixCubix]

Well i thought about this because one day I put a kerbal on a rocket engine, and I throttle it up and I saw it fly with a certain speed, so by conclucion an engine has a determined force and that force is acting on the kerbal who has a determined mass, I never have done this equation because I cant calculate the time that the kerbal was exposed with the thrust, and the other question is, All kerbal got the same mass? and does a kerbal in the cockpit affects the rocket?

[K^2]

I don't think kerbal's mass is added to the rocket when he's inside. When on EVA, however, you can get a rough idea of the kerbal's mass by using rocket pack to get some speed, and colliding head on with capsule, or some other light object, and seeing how the speeds of the two change after collision. Having tried the "get out and push" solution to trajectory correction after running out of fuel in orbit, I can definitely say that a kerbal is considerably lighter than even the Mk I capsule. But I have not done the math to try and find the exact value.

[Holo]

They weigh 31 kg when on EVA http://forum.kerbalspaceprogram.com/showthread.php/15504-The-mass-of-a-kerbal

[magnemoe]

With their size 32 kg is pretty realistic. Do they have any weight on ladders? Thinking on the ladder launches from eve and other places.