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2564088357203409
2 năm trước
Một con lắc lò xo treo thẳng đứng dđđh có biên độ 3cm, lò xo có độ cứng 400N/m, độ biến dạng tại vtcb là 10cm. Lực kéo về và lực đàn hồi khi vật ở vị trí cao nhất
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Ai làm đc câu này cho hẳn 20đ và vote 5 sao ko dùng google dịch My name is Helen Jones and my favourite sport is volleyball. I play volleyball for the school team and last week we had an important game. In the second half of the game, I fell over and hurt my arm. I couldn’t move my arm and it hurt a lot. My sports teacher called for an ambulance and they took me to hospital. The doctors looked at my arm and said, “It’s broken.” I couldn’t believe it! I was sad because I couldn’t play volleyball but also because our school skiing holiday was the next day! The doctors said, “Sorry, you can’t go skiing because you need to stay in hospital for one night.” I was so unhappy that night when I thought about the holiday. Then something amazing happened the next day that helped me forget about the holiday. I was having lunch in the hospital when Robert Black, my favourite volleyball player, walked into the room! He was in hospital to see a doctor about his leg so he decided to visit the children in the hospital. I talked to him about volleyball and a nurse took a photo of us together. That photo’s on my bedroom shelf now! It was much more exciting than a skiing holiday!

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