user-avatar
bichdangthi21
2 năm trước
Một vật được ném thẳng đứng lên trên với vận tốc v0=20m/s từ mặt đất . Chọn mặt đất làm gốc thế năng . Bỏ qua lực cản của không khí và lấy g = 10m/s2 . a/ Xác định độ cao cực đại mà vật đạt được . b/ Ở độ cao nào vật có động năng bằng thế năng . c/ Xác định vận tốc của vật khi chạm đất . Thời gian kể từ khi ném vật đến khi vật chạm đất bằng bao nhiêu? (giúp mình với ạ)
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

18.The dog won the race. The dog is mine. ……………………………………………………………………………………………….. 19.Show me the shoes. You bought them yesterday. …………………………………………………………………………………………………. 20.Our school has a good laboratory. The students practise chemistry in this laboratory. ……………………………………………………………………………………………….. 21. Edward has just moved to France. His mother died last year. …………………………………………………………………………………………………. 22.Those are the books. He has just bought them from the bookstore. ______________________________________________________________________ 23.The book is very interesting. It was written by Jane Austen. ______________________________________________________________________ 24.The lady gave me good advice. I spoke to her an hour ago. ______________________________________________________________________- 25.Is that the computer? Your father bought it last month? ___________________________________________________________ 26.A girl was injured in the acciddent. She is now in the hospital. ___________________________________________________________ 27.A man answered the phone. He told me you were away. ____________________________________________________________ 28.A bus goes to the airport. It runs every half an hour. ___________________________________________________________ 29.I met Jane’s father. He works at the university.

6. The day was rainy. She left on that day. .................................................................................................................................................... 7. One of the elephants had only one tusk. We saw these elephants at the zoo. ..................................................................................................................................................... 8. This is Mrs. Jones. Her son won the championship last year. ............................................................................................................................................... 9. Is this the style of hair? Your wife wants to have it. ................................................................................................................................................ 10. Max isn’t at home yet. That worries me. ................................................................................................................................................... 11.I bought a motor. I can use it to travel to work every day. …………………………………………………………………………………………………. 12. My cell phone has become necessary part of my life. I only bought it a month ago. …………………………………………………………………………………………………. 13.My roomate has never been on the Internet. She is afraid of computers. …………………………………………………………………………………………………. 14.Some people dream of a job. They can do the job without technology. …………………………………………………………………………………………………. 15.The man is a computer expert. You were talking to him. …………………………………………………………………………………………………. 16.Some documents have been found. They were stolen from a car. …………………………………………………………………………………………….. 17.Marta has a brother. Her brother’s name is Manuel. ………………………………………………………………………………………………..

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team