问题
填空题
小球从离地高35m的平台开始以30m/s的初速度做竖直上抛运动，从抛出到落地所需要的时间为_________s，整个过程中的速度改变量的大小为_________m/s（重力加速度g＝10m/s2）。
答案
7，70
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小球从离地高35m的平台开始以30m/s的初速度做竖直上抛运动，从抛出到落地所需要的时间为_________s，整个过程中的速度改变量的大小为_________m/s（重力加速度g＝10m/s2）。
7，70
Sam is a 9-year-old dog. He has a : painting. The hobby not only makes him famous, but also makes him . Sam has drawn 22 paintings. of them are abstract (抽象派的). He likes to start with darker colors moving on to lighter ones. Sam’s paintings are in the US. Some of them sell for $1,700. A woman even bought one a birthday gift for her dog. “He loves painting and always paints for hours,” said Sam’s owner, Mary. Sam was once a rescue (搜救) dog. One day, Mary wanted to teach him . “I dolphins paint and elephants paint , so I thought that maybe my dog could paint, too,” said Mary. She is right. Now Sam is one of the world’s animal artists. People call him “Da Vinci in the dog world”.
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