问题
选择题
一物体从高处自由下落，经3s落地，则该物体下落1s时，离地高度是（g取10m/s2）
A．40m
B．15m
C．10m
D．5m
答案
答案：A
题目分析：由自由落体运动公式可知下落1s时
，初始地点距离地面高度为
，所以该物体下落1s时，离地高度是40m，Ａ对；
点评：本题难度较易，熟悉自由落体运动的公式，同时要注意题目所要求的是距离地面的高度
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一物体从高处自由下落，经3s落地，则该物体下落1s时，离地高度是（g取10m/s2）
A．40m
B．15m
C．10m
D．5m
答案：A
题目分析：由自由落体运动公式可知下落1s时，初始地点距离地面高度为，所以该物体下落1s时，离地高度是40m，Ａ对；
点评：本题难度较易，熟悉自由落体运动的公式，同时要注意题目所要求的是距离地面的高度
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| The Spring Festival is our ① people's festival. There are different names for each year. We call it the year ② sheep, the year of dog… and this year is the year of chicken. ③ the day of the festival, people are very busy shopping and ④ their houses. On the Eve (除夕), there ⑤ a big family dinner. ⑥ dinner, all the family stay up late (守夜) to welcome the new year. At midnight we have some dumplings. We ⑦ many good TV programs. ⑧ the first day of the New Year, people ⑨ their new clothes and go to their friends' houses. They say " Happy New Year" to each other. Children will ⑩ money from their parents and relatives. |
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