New servers, hooraaaay! More bandwidth, more power.
Use s=ut+1/2at^2 twiceFor the first two carriages40=2u+2aFor the first for carraiges80=4.4u+9.68aSolve thes to get u=710/33a=-50/33then train takes s=(v^2-u^2)/2a=(710/33)^2/(2*50/33)=148.98 carrariages