A typical wheel used on a roller coaster is constructed by taking an aluminum hub and bonding a polyurethane tire to the hub's outside diameter. This entire “wheel assembly” is then connected to the axle through a bearing.
I believe the formula you're looking for is force equals mass times acceleration. in this case the answer would be 3.
It means that there's something else besides speed that contributes to reaction distance. So even when speed is zero, reaction distance is still not zero.
I'm sorry I am not surely understanding what you a re trying to ask here
