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Ducsu123
2 năm trước
Giải chi tiết giúp mình bài này nhé! Mình cảm ơn ạ! Ném một vật thẳng đứng lên cao với vận tốc ban đầu 10m/s từ độ cao 5m so với mặt đất. Lấy g=10m/s^2. a) Tính độ cao cực đại b) Tính độ cao của vật khi vận tốc giảm đi một nửa so với vận tốc đầu c) Vật có vận tốc bao nhiêu khi độ cao bằng 3/2 độ cao ban đầu d) Tính vận tốc khi vật vừa chạm đất e) Trong giây cuối cùng, động năng của vật tăng thêm một lượng là bao nhiêu?
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II. Chọn từ có cách phát âm khác với các từ còn lại 1. A.played B.watched C.helped D.pushed 2. A.devoted B.divided C.suggested D.learned 3. A.finished B.missed C.lived D.hoped 4. A.tried B.opened C.added D.lived 5. A.breathed B.seated C.heated D.wanted 6. A.guided B.managed C.started D.chatted 7. A.threatened B.answered C.promised D.traveled 8. A.invented B.completed C.surrounded D.risked 9. A.liked B.involved C.believed D.happened 10. A.collected B.moved C.lasted D.shouted 11. A.wanted B.disappointed C.looked D.needed 12. A.helped B.played C.passed D.hoped 13. A.worked B.stayed C.installed D.improved 14. A.intended B.decided C.delicated D.dangered 15. A.cleaned B.educated C.referred D.delayed 16. A.looked B.laughed C.solved D.finished 17. A.raided B.admired C.afforded D.collected 18. A.supposed B.closed C.delayed D.visited 19. A.married B.enjoyed C.finished D.explored 20. A.selected B.failed C.deleted D.faded III. Hãy chọn từ có phát âm khác nhất. 1. A. played B.watched C.helped D.pushed 2. A. devoted B.divided C.suggested D.learned 3. A. finished B.missed C.lived D.hoped 4. A. tried B.opened C.added D.lived 5. A. breathed B.seated C.heated D.wanted 6. A. guided B.managed C.started D.chatted 7. A. threatened B.answered C.promised D.traveled 8. A. invented B.completed C.surrounded D.risked 9. A. liked B.involved C.believed D.happened 10. A. collected B.moved C.lasted D.shouted

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