m = 800000кг
v1 = 36м/c
v2 = 54м/c
A - ?
A = Wкин2 - Wкин1
A = (m*v2^2)/2 - (m*v1^2)/2 = (800000*2916)/2 - (800000*1296)/2 = 1166400000 - 518400000 = 648000000 Дж = 648 МДж
