You do not calculate the G-Force be simply adding the difference in speed. So it is 25% faster, it would not create 25% more force. There is a seriously complicated formula for working it out,
No, you're right, I used the formula a=v^2/r to work it out
So why then can Dodonpa at fuji q go from 0-109.6 in 1.8 seconds and only travel over only a 165ft tower and no one has died on that???
Thats because there's about 2500ft of track before the tower and since the coaster runs on tyres I think that it would gain a lot more friction than a rocket coaster- those brakes are probably just trims and I doubt that they would significantly slow the coaster down that much