King Kai’s planet has the same amount of gravity just like planet Vegeta has. Goku was barely able to walk, but he was still able to push forward even though he was still wearing his weighted gear, its weight was multiplied by ten, (estimate being about 1400 pounds now) but still not Superman levels of strength. Goku during his training on King Kai’s planet was taught an ability known as KaioKen, (Translated: Super God Fist) which Multiplies the users power up to 20x, or higher if proper training is done. So take the times twenty and apply to the 1400 pounds, Goku should be able to lift about 28000 pounds or 14 tons in total. Goku would then later use his newfound strength and abilities to fight Nappa and Vegeta, Nappa went down after the Kaioken technique, but Vegeta was harder to bury. Vegeta Was estimated to be about 2.25 times stronger than Goku, Vegeta should be able to lift about 31.5 tons. Goku with the help of KaioKen surpassed Vegeta’s power easily, by using times four Kaioken, he would be able to lift about 56 tons easily. (Peters slide