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Объяснение:
m1=1кг
v1=8м/c
m2=2кг
v2=3.5 м/c
Найти u-?
Решение
По закону сохранения импульса
p1+p2=const
m1*v1+m2*v2=const
После столкновения
m1*v1+m2*v2=(m1+m2)*u
В проекции на ось OX
m1*v1-m2*v2=(m1+m2)*u
1=3u
u=0.3м/c
ответ общая скорость равна 0.3 м/c