Một vật được ném thẳng đứng tại mặt đất với vận tốc ban đầu 10m/s lấy m = 5 kg a xác định cơ năng của vật tại vị trí ném b xác định độ cao cực đại c Xác định vị trí để động năng bằng 3 lần thế năng d xác định vận tốc khi động năng bằng 3 lần thế năng

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I.Bài tập về các thì 1.I (learn) English for seven years now. 2.But last year I ( not / work ) hard enough for English,that's why my marks (not / be) really that good then. 3.As I (pass / want) my English exam successfully next year,I (study) harder this term. 4.During my last summer holidays,my parents (send) me on a language course to London. 5.It (be) great and I (think) I ( learn) a lot. 6.Before I (go) to London,I (not / enjoy) learning English. 7.But while I (do) the language course,I (meet) lots of young people from all over the world. 8.There I (notice) how important it (be) to speak foreign languages nowadays. 9.Now I (have) much more fun learning English than I (have) before the course. 10.At the moment I (revise) English grammar. 11.And I (begin / already) to read the texts in my English textbooks again. 12.I (think) I (do) one unit every week. 13.My exam (be) on 15 May,so there (not / be) any time to be lost. 14.If I (pass) my exams successfully,I (start) an apprentice ship in september. 15.And after my apprenticeship,may be I (go) back to London to work there for a while. 16.As you (see / can) ,I (become) a real London Fan already. II.Chia động từ cho đúng 1.In all the world,there (be)....... only 14 mountains that (reach).......above 8,000 meters. 2.He sometimes (come).......to see his parents. 3.When I (come) ..........,she (leave)........for Dalat ten minutes ago. 4.My grandfather never (fly).......in an airplane,and he has no intention of ever doing so. 5.We just (decide) ........that we (undertake) .......the job. 6.He told me that he (take).....a trip to californa the following week. 7.I knew that this road (be).....too narrow. 8.Right now I (attend)......class .Yesterday at this time I (attend) .....class. 9.Tomorrow I'm going to leave for home.When I (arrive)......at the airport,Mary (wait).....for me. 10.Margaret was born in 1950 .By last year,she (live)......on this earth for 55 years.