People really do need to read a lot more of dragonball z. I would like to make some corrections and majority of them is to soljer. This is like the 90eth time bringing this up. Is is a fact that the ki planets have amazing gravity. Goku was lifting the 40 tons weights on the ki planet. So due to the fact that the ki planet has amazing gravity goku was lifting alot more than you are presuming. Vegita was lifting weights in 500 times earth gravity. Goku was lifting weights in 100 time earths gravity.
To speed. Well goku in the regular dragonball z era stated while fighting tien taking off his weighted close as moving faster than the speed of light. Goku while training with mr popo, again on regular dragonball z was dodging lighting. Krillin, tien, yamcha was racing around the world (as kids) and krillin was running beside a car that was going 200 mph and he left the car in a blitz. Goku as a child was fighting master roshi and spinned around and completely disappeared from any kind of sight and noone was able to see if for a while. Goku as a child was moving so fast that he created 8 after images of himself that was doing different things.
In this episode this is where goku says that he is moving at the speed of light. Cant find the entire fight but i will find it so that you can hear it.
http://www.youtube.com/watch?v=SjWZejkB_dA&mode=related&search=
Strength. Im not even going to go back to that. I have already told you of some strength feats. By the way. Even though I know for a fact that dbz character has amazing strength, flash dont have any kind of super strength or zoom but wonderwoman and superman said themselves that when they were hit by the two those was some of the hardest punches that they felt.