Ở một tầng tháp cách mặt đất 45m, một người thả rơi một vật. Một giây sau, người đó ném vật thứ hai xuống theo hướng thẳng đứng. Hai vật chạm đất cùng lúc. Tính vận tốc ném vật thứ hai. ( g = 10m/s2)

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  "I didn’t go to class last night because my car broke down.” “You ____________ mine. I wasn’t using it.”
  

• Choose a word that has different stress pattern:

  hospital                 mischievous                   supportive                 special

• Choose a word that has different stress pattern:

  family                 whenever                   obedient                 solution

• Choose a word that has different stress pattern:

  biologist               generally              responsible               security

• Choose a word that has different stress pattern:

  confident                important                  together                  exciting

• Choose a word that has different stress pattern:

  possible                university               secondary                suitable

• Choose one sentence that has the same meaning to the root one:

  They are not allowed to go out in the evening by their parents.
  
  

• Choose one sentence that has the same meaning to the root one:

  Although my parents are busy at work, they try to find time for their children.
  
  

• Choose one sentence that has the same meaning to the root one:

  His eel soup is better than any other soups I have ever eaten.
  
  

• Choose one sentence that has the same meaning to the root one:

  She gets up early to prepare breakfast so that her children can come to school on time.