Question: can ssj3 goku beat broly?
Answer: Broly was shown to have some difficulty fighting Gohan in his super saiyan 2 form who could be easily decimated by Buu. Goku was stronger than the fat Buu in Super Saiyan 3, so he would easily crush Broly. And Super Saiyan 3 current Goku is infinitely stronger than Broly.