user-avatar
hung2005
2 năm trước
một vật m được ném thẳng đứng lên cao với vận tốc v từ mặt đất . Gia tốc rơi tự do là g , bỏ qua sức cản không khí . khi vật có động năng bằng thế năng thì nó ở độ cao so với mặt đất là .
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Read the passage, and then choose the correct answers. ( Đọc đoạn văn, và sau đó chọn câu trả lời đúng.) Tokyo is the capital of Japan. In Tokyo, there are always too many people in the place where you want to come. People are very polite even when they often spend a long time on traffic jams. Tokyo is different from London when you want to walk to a place. During the day, most people travel to work by train. Tokyo people buy six million train tickets every day. Although they are usually crowded, Japanese trains are very good. They always leave and arrive on time. On a London train, everybody in a seat seems to be asleep whether the journey is long or short. The worst time to be in the street at night is about 11.30 when the nightclubs are closing and everybody wants to go home. 1.Tokyo is different from London because ……………………………………….. A. it has a larger population B. it is a noisy city C. it is more difficult to walk to somewhere D. its people are friendly and more polite 2. When does the writer think the worst time to go into the street? A. When the nightclubs are closing. B. At 8.00 am. C. When the trains are full. D. At 11.30 am 3. What does the writer think of Japanese trains? A. They are very nice and comfortable. B. There are not enough trains. C. They often run late. D. They leave and arrive on time. 4. In London trains, every British in a seat …………………. A. reads a newspaper B. looks like being asleep C. talks with other people D. looks out of the window. 5. Which statement is NOT true according to the passage? A. Most people in Tokyo travel to work by train. B. It is very difficult to go around in Tokyo. C. When Japanese people are on traffic jams, they are not polite. D. Trains in Tokyo are very good – they always leave and arrive on time.

mik sẽ vote 5 sao nha II)-Complete the sentences, using the correct passive form of the verbs in brackets. (1.25pts) 16. Severe damage to environment ___________ by prolonged droughts in Central Vietnam last July. (cause) 17.Tomorrow the dam ____________ to prevent salt water from entering the fields in Tien Giang Province. (close) 18.The hot weather __________ to continue while there were longer hours of sunshine. (expect) 19.Two naval ships _____________ to the island to rescue fishermen. (send) 20.Oil rigs throughout the Gulf of Mexico __________ during Hurricane Katrina. (hit) D. WRITING (1.25pts) Change into passivoice. 36 . Mary types letters in the office. ………………………………………………………………………………………………………… 37. His father will help you tomorrow. ………………………………………………………………………………………………………… 38. Science and technology have completely changed human life. ………………………………………………………………………………………………………… 39. Peter broke this bottle. ………………………………………………………………………………………………………… 40. They are learning English in the room. …………………………………………………………………………………………………………

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