-
1.2 1.3 1.4 1.5 1 \ 1000 \
1 6
1 6 10 10 60 10 60 10/60 =6 6 \ 6m\s
10 50 6 \ 60 ,
10 0.5 60 70 0.5/10 =20 \ 60 0.5 60