Тележка массой 0,8 кг движется по инерции со скоростью 2,5 м/с. На тележку с высоты 50 см падает кусок пластилина массой 0,2 кг и прилипает к ней. Какая энергия перешла во внутреннюю при ударе?

 

(С пояснениями)

pomogite pojalyusta chto takoe There is There are

 ПЕРЕВЕДИТЕ НА РУССКИЙ.

   She moved about the room softly with quick secret movements.First she took Jane's box ,opened it and shut it quickly.Then she opened the wardrobe and took somethink out.Then she went out.

      In the garden somebody was speaking in a low voice.There were some people there.Jane and Michael got out of bed and came up to the window.They saw a little figure and two gigantic ones near their gate.

     Mrs. Corry with Fannie and Annie ,  said Jane 

    Fannie had two long ladders on her shoulder and Annie had a large pail of something that looked like glue and a large brush.Then the front door opened and Mary Poppins came to meet them.She had a basket on her arm,and in the basked  there was something.It gave out a soft,mysterious light.

         "Come on , we must hurry!We haven't much time ," said Mrs. Corry

 Jane and Michael saw them go down Cherry Tree Lane,and then they turned to the left and went up the hill.When they got to the top of the hill,where there were no houses but only grass and flowers , they stopped.

                  "What are they going to do ? " asked Michael.But there was no need for Jane to answer bacause they could see what was happening.

          Annie and Fannie fixed the ladder with its one end on the ground and the other in the sky.Mrs.Corry took the brush and the pail of glue and climbed the ladder.Mary Poppins with her basket climbed the other ladder.

         Then the most surprising thing happened -Mrs.Corry started covering the sky with the glue and Mary Poppins took something shiny from her basket and fixed it to the glue.She was sticking the gingerbread stars to the sky!They understood it when she took her hand away.When the star was placed on the sky it began  to shine brightly.

Заданы функции f(x)=(3+2x)/7 и g(x)=3/(2+x). Найдите f(9)+g(-1)

При каком наибольшем натуральном n число n!+5n+52 является точным квадратом? (n!=1⋅2⋅…⋅n — произведение всех натуральных чисел то 1 до n)