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一、填空题
1.重力势能 动能
2.D、F A、B C、E
3.80% 2160
4.15 80%
5.解法一:拉力F;; 解法二:动滑轮的重G动;;
6.900 75
7.80% 1800
二、选择题
8.D
9.B
10.C
11.B
12.B
13.D
14.C
三、实验题
15.(1)匀速;(2)弹簧测力计提升的高度值有错误;(3)80%;(4)变大;(5)略。
四、计算题
16.略
17.(1)1.2×104kg;(2)31.25s。
18.(1)汽车速度快则耗油量较低;(2)6.8;(3)72000J。