题目

(8分)在“研究匀变速直线运动”的实验中,用打点计时器记录纸带运动的时间,计时器所用电源的频率为50Hz,图为小车带动的纸带上记录的一些点,在每相邻两点间都有四个点未画出,按时间顺序取0.1.2.3.4.5六个点,用米尺量出1.2.3.4.5点到0点的距离如图所示. a.由纸带可判定小车做______ 运动 b.若小车做匀变速直线运动,那么当打计数点3时小车的速度为________ m/s. 小车的加速度大小为________ m/s2 , 方向为________Read and choose. (读一读,选一选。)A. postman B. coach C. dancer D. scientist E. fisherman【1】My uncle is a __________. He works in a gym.【2】Uncle Zhang is a __________. He works at sea.【3】I like science. I want to be a __________ in the future.【4】My father works in a post office. He’s a __________.【5】Sarah is good at dancing. She wants to be a __________.
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