Шар массой 100 г , имеющий скорость 5 м/с, сталкиваетося с неподвижным шаром массой 400 г, после чего второй шар получает скорость 2 м/с. Какова скрость первого шара после столкновения? Потерями энергии пренебречь.

 

сочинение 100-200 слов . do you think britain is good destination for a summer holiday ? why/why not ?

H3PO4 и H2SiO3 дайте сравнительную характеристику физических и химических свойств. Превидите уравнения реакции

Write a tag for each sentence.

1.He  is at home,.......................?

2.She is ill,...........................?

3.They are in the fifth form,..............................?

4.You are a pupil,........................?

5.He is ten,.........................?

6.He isn"t hungry,...........................?

7.She isn"t a pupil,.........................................?

8.They aren"t difficult,..................................?

9.You are not cold,............................?

10.He is not tired,.........................?

11.Tom is shorter than Jack,.........................?

12.Helen is cleveler than her frind,................................?

13.Mr Blak is yuonger than Mr Smith,........................?

14.Helen"s bike is older than Kete"s bike,..........................?

15.The apple is testerthan the pear,..................?

16.Mary isn"t at school,.........................?

17.Tom isn"t here today,........................?

18.Kate"s son isn"t a pupil,.....................?

19.It isn"t cold today,.................?

20.Maths is difficult,..............?

21.He was in London last autumn,..............................?

22.She was at the zoo last  Suturday,.....................?

23.They wery busy,..............................?

24.The boys were at the stadium,........................?

25.Bill was at home,......................?

26.They weren"t happy there,..................?

27.Robert"s grandparent weren"t in Great Britain last year,...................?

28.Frank wasn"t in the country,............................?

29.It isn"t cold,...........................?

30.It"s cold today,...........................?

31.it is cold,.......................?

32.It is nice cat,.....................?

33.There is a cat in the box,...........................?

34.There is book on the desk,.......................?

35.There is blackboard there,........................?

36.There is an exercise-book,.......................?

37.It is your exercise-book,.............................?

38.The cake is on the table,...........................?

39.There is  a cake on the table,...................?

40.The ball is under the table,.......................?  

Костя и Витя решали задачи. Костя решил в три раза больше задач, чем Витя, а Витя на 18 задач меньше, чем Костя. Сколько задач решил каждый из мальчиков?