Three years ago, I got to know a poor lady named Rose. She had no children and lived alone. When I went to visit her, I always took her some1and food. One day she asked me to have coffee and delicious food for lunch at a restaurant near her home.

    2the way, I began to worry: I knew that she had no money, but if I offered to3the lunch, I was afraid I must hurt her.

    There were many people in the4and all of them were happy. Rose told me to sit and drink coffee by the window. Then she went into the5. I didn't know what happened. After about 20 minutes, she came out with some food. Then we started to enjoy the delicious food together. She told me that the restaurant allowed people to work for a meal6they had no money. The restaurant also might give them a free meal if they were not7to work, especially for the disabled.

    I 8remember the beautiful afternoon I shared with Rose. We had a meal, and Rose paid for it by her work. The weather was9and bright, and everyone's smile was warm and bright as well.

    I'm still thinking that life cannot be easy to us, but we can still do something for our friends and other people. The world will be10if everybody would like to share happiness with others.

下列计算中，结果是a⁶的是（　　）

一个做匀速直线运动的物体在2min内通过了300m的路程，它运动的速度是____ m/s，这个物体在前10s内的速度是____ m/s．