题目：
(9分)一小球沿光滑斜面向下运动，用每隔0.1s曝光一次的频闪照相机拍摄下不同时刻小球的位置照片如图所示，选小球的五个连续位置A、B、C、D、E进行测量，测得距离s1、s2、s3、s4的数据如表格所示。
⑴小球沿斜面下滑的加速度大小为__________m/s2.
⑵根据以上数据求出小球在位置A和位置E的速度分别为______m/s_______m/s.
⑶能否根据以上数据求出斜面的倾角？简要说明理由。（重力加速度g为已知）
答案：
⑴1.10 m/s2. ⑵
⑶能，由 
得 
和
已知
本题考查利用频闪照片测量加速度大小的实验（1）加速度可由逐差法求得
="1.10" m/s2. ⑵D点速度根据中间时刻的瞬时速度等于平均速度求得
1.1m/s，从D到E有
，同理先求得B点速度再求Ａ点速度（3）由于斜面光滑，物体在下滑过程中只受重力和支持力作用，重力沿斜面向下的分力提供加速度
点评：频闪照片模型经常用于自由落体或其他的匀变速直线运动中，处理方法类比于打点计时器，两点间的时间间隔相同
hat the refrigerator overheard our talk. The very next day it went wrong. The repairman told us we needed a new unit. Cost:$600. Not long after that, we got a refund（赔偿金）from the shop, enough to pay for a trip to Mexico. “I’ve something to tell you,” I said to my wife in a low voice. “How about the living-room?” she suggested. I remembered the color TV set was there. “No, not there. Let’s go out.” I showed her the check as we stood on the driveway. We held each other excitedly and hardly noticed the rain. My car was parked within5 meters. I didn’t think anything about it at the time. As I started for the airport the next day, the car began making strange sounds. Changing the engine cost about $ 1, 000.
s published and I am paid for, the word processor（文字信息处理机）is going to go for sure. It’ll know. 
n equipment in the writer’s home 