中学生网络课堂
，下列说法中正确的是（ ） 
和
只能是正值，不可能为负值本课配套习题挑战模式3/5
单选题
难度系数：
3.伽利略在著名的斜面实验中，让小球分别沿倾角不同、阻力很小的斜面从静止开始滚下，他通过实验观察和逻辑推理，得到的正确结论有（ ）
| A: 倾角一定时，小球在斜面上的位移与时间成正比 |
| B: 倾角一定时，小球在斜面上的速度与时间成正比 |
| C: 斜面长度一定时，小球从顶端滚到底端时的速度与倾角无关 |
| D: 斜面长度一定时，小球从顶端滚到底端所需的时间与倾角无关 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWAvuinkuS4gOWumuaXtu+8jOWwj+eQg+WcqOaWnOmdouS4iueahOS9jeenu+S4juaXtumXtOeahOW5s+aWueaIkOato+avlA==
- 提示2：IOWAvuinkui2iuWkp++8jOWwj+eQg+a7muWIsOW6leerr+aXtumAn+W6pui2iuWkp++8jOaXtumXtOi2iuefrS4=
- 答案：Qg==
本课配套习题挑战模式4/5
多选题
难度系数：
4.一个物体位移与时间的关系为
（
以
为单位，
以
为单位），下列说法中正确的是（ ）
（以为单位，以为单位），下列说法中正确的是（ ） A: 这个物体的初速度为 |
B: 这个物体的加速度为 |
C: 这个物体的初速度为 |
| D: 这个物体的加速度方向一定与初速度方向一致 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOagueaNrjxpbWcgd2lkdGg9ODEgaGVpZ2h0PTM5IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRjAvNUUvckJBQ0ZGTmd5ckNEamFXQUFBQUMxMDhlc2gwNjAxLnBuZyI+
- 提示2：PGltZyB3aWR0aD0xNSBoZWlnaHQ9MjIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yQy82Ny9yQkFDRTFOZ3lxV1M0ekp6QUFBQk9JM0FTQmsxODIucG5nIj7kuI48aW1nIHdpZHRoPTEzIGhlaWdodD0xNCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0YwLzVFL3JCQUNGRk5neXJDQ25Ra2pBQUFCRnNHeGF5bzIwNS5wbmciPumDveS4uuato+WAvA==
- 答案：QixE
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
本课配套习题挑战模式5/5
多选题
难度系数：
5.一物体做匀变速直线运动，某时刻速度的大小为
，
后速度的大小变为. 在这内该物体的（）
，后速度的大小变为. 在这内该物体的（） A: 位移的大小可能小于 |
B: 位移的大小可能大于 |
C: 加速度的大小可能小于 |
| D: 加速度的大小可能大于 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOiLpTxpbWcgd2lkdGg9MTUgaGVpZ2h0PTIyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMkMvNjgvckJBQ0UxTmd5cldSUGEtWUFBQUJQampNaUVROTQ0LnBuZyI+5LiOPGltZyB3aWR0aD0xNCBoZWlnaHQ9MjIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yQy82OC9yQkFDRTFOZ3lyWHhHUTFNQUFBQkkwUzNxdEkyODIucG5nIj7lkIzlkJE=
- 提示2：IOiLpTxpbWcgd2lkdGg9MTUgaGVpZ2h0PTIyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMkMvNjgvckJBQ0UxTmd5cldSUGEtWUFBQUJQampNaUVROTQ0LnBuZyI+5LiOPGltZyB3aWR0aD0xNCBoZWlnaHQ9MjIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8yQy82OC9yQkFDRTFOZ3lyWHhHUTFNQUFBQkkwUzNxdEkyODIucG5nIj7lj43lkJE=
- 答案：QSxE
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
