Ствол горизонтально расположенного орудия имеет массу, равную 1000 кг. Масса снаряда равна 9 кг. Модуль скорости снаряда при вылете из ствола

1. English test was written by the student at the lesson.
2. I am asked by the teacher at every lesson.
3. This book will be published by them next week.
4. Tom is looked after by (his sister) Ann.
5. Many letters were received by us.
6. Some problems were discussed by us.