кто шарит в этом?! 4. Как объясняется парадокс « близнецов»? 5. Выполняется ли в релятивистской механике третий закон Ньютона? 6. Имеет ли смысл в релятивистской механике понятие «инертной массы »? 7. Может ли в результате аннигиляции позитрона и электрона образоваться один фотон?

T₁=1/4t;   v₁=120 km/ч t₂=3/4t;   v₂=100  km/ч 1)vcp=sвесь/tвесь; 2)  sвесь=s₁+s₂=v₁t₁+v₂t₂=v₁1/4t+v₂3/4t 3)  tвесь=t         vcp=v₁1/4t+v₂3/4t                     =  1/4v₁+3/4v₂=                                                       t             =1/4·120+3/4·100=30+75=105  км/ч.  - средняя скорость. ответ:   105  км/ч.

Объяснение:

My favourite sport is football

I think all people have their favourite sport. It is not necessary to be an athlete in this sport, you can just be a fan. My favourite sport is football.

When I was a little girl, my dad took me to football matches that were held in our city. We used to sit in the stands and, like hundreds of other people, rejoice over the victory of our team and loudly shout and whistle if the players of the opposing team took possession of the ball.

A few years have passed, and now I go to watch football matches with my friends. Sometimes we watch interesting or important games on TV and then discuss their best moments. I support not only our home team and the national team of our country. I also have a favourite football club — it is Real Madrid from Spain, and my favourite player is Cristiano Ronaldo.

Every football game is a battle between players, coaches and their tactics. Football means unpredictable results and all kinds of emotions experienced by footballers and their fans. That is why I love this wonderful game!

с разу говорю не мой ответ удачи