试题与答案

一物体做自由落体运动,自由下落L时,速度为v,当物体自由下落的速度速度达到v/2

题型:填空题

题目:

一物体做自由落体运动,自由下落L时,速度为v,当物体自由下落的速度速度达到v/2时,它下落的长度是______.(g取10m/s2

答案:

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题型:阅读理解

阅读对话,判断正误,正确的写"T",错误的写"F"。

Jenny, Li Ming and Danny want to send postcards to their friends. They come to the post office.

Clerk: Where are you sending your postcard?

Li Ming: I'm sending it to Sichuan. How much is the stamp, please?

Clerk: One yuan.

Jenny: I'm sending these postcards to Canada. How much are the stamps, please?

Clerk: One stamp is ten yuan.

Jenny: I'll take two, please. Danny!  What are you doing?

Danny: I'm writing nine postcards to my mother.

( ) 1. Danny needs one stamp.

(     ) 2. A stamp is one yuan to Sichuan.

(     ) 3. Two stamps are ten yuan to Canada.

( ) 4. Li Ming needs nine stamps.

( ) 5. Jenny needs two stamps,

( ) 6. They need one hundred and one yuan.

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