1.Найти потенциальную энергию тела массой 3 кг, падающего свободно с высоты 5 м. 2.Камень брошен вертикально вверх со скоростью 10 м/c. На какой высоте кинетическая энергия камня равна его потенциальной энергии? 3.Первое тело массой 2 кг движется со скоростью 6 м/c, второе неподвижно. После столкновения оба тела движутся вместе со скоростью 2 м/c. Какова масса второго тела? 4. Найти изменение импульса тела массой 900 г при изменении скорости от 72 км/ч до 108 км/ч. 5.Определить массу тела, если на него действует сила тяжести 100 кН. 6. Определить ускорение спутника, если он двигается со скоростью 8 км/с по орбите 600 км над Землёй .

Nowadays people have started to realize that good health is very important, much more important than wealth. To be in good health people must follow a healthy life style, to do things that will help keep a healthy body and mind, to feel fit.There are several ways to do it. The state of your body depends on how much time you spend doing sports. At least everybody must do morning exercises every day. The healthiest kinds of sports are swimming, running and cycling. Healthy food is also a very important factor. The daily menu should include meat, fruit and vegetables, milk product, which are rich in vitamins, fat, proteins and etc. On the other hand modern diets are very popular especially among women. Diets may be harmful, if they are used in the wrong way. To be healthy, people should get rid of their bad habits. It’s necessary to stop smoking and drinking much. Everyone should remember that cigarettes, alcohol and drugs destroy both body and brain. In addition it is recommended to watch TV less, avoid anxiety and observe daily routine. )

1)Good health is very significant.          

2)All diets are useful and healthy.          

3)It is recommended to do yoga to be in good health.      

4)Alcohol and cigarettes influence only on body.          

5)It is important to get rid of bad habits in order to keep a healthy body and mind.          

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