Con lắc lò xo treo thẳng đứng dao động điều hoà (vật nặng có khối lượng 200g). Khi vật cách vị trí cân bằng một đoạn 4 cm thì vận tốc của vật bằng không và lúc này lò xo không bị biến dạng . Lấy g = 10 m/s². Động năng của vật ngay khi cách vị trí cân bằng 2 cm là ?        

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Một số câu hỏi khác có thể bạn quan tâm.

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  don't / the / will / very / I / think / exam / be / difficult //.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  wait / you / will / an / here / get / for / and / aspirin / I //.
  
  

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• Find a mistake in the four underlined parts of the sentence and correct it:

  Cotton is one of the most popular fibers used to do clothes.

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  I can’t understand what they talk about.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Nobody knows that his or her life will be like in a ten years' time.