how much gravity were Trunks and Vegeta training when they trained together before the martial arts tournament?
I think it's 150 only If you aren't​ satisfied let us do some math if kid trunks is about 20 kg then he would weight 20*150*10=30000N which is 3tons(3000kg) in normal gravity if he is at 150,000 times gravity then kid trunks would weight 20*150,000*10=30000000 which is 3000tons remember Goku training with king Kai in other world he say that 4 tons is too much for base form and too light for super Saiyan form hence​ 150 is reasonable