1/4单选题
难度：
1.汽车
在红灯前停住，绿灯亮时启动，以
的加速度做匀加速运动，经过
后以该时刻的速度做匀速直线运动. 设在绿灯亮的同时，汽车
以
的速度从车旁边驶过，且一直以相同的速度做匀速直线运动，运动方向与车相同，则从绿灯亮时开始
在红灯前停住，绿灯亮时启动，以的加速度做匀加速运动，经过后以该时刻的速度做匀速直线运动. 设在绿灯亮的同时，汽车以的速度从车旁边驶过，且一直以相同的速度做匀速直线运动，运动方向与车相同，则从绿灯亮时开始 | A | 车在加速过程中与车相遇 |
| B |  相遇时速度相同 |
| C | 相遇时车做匀速运动 |
| D | 两车不可能再次相遇 |
- 提示1：
- IOiLpTxpbWcgd2lkdGg9MTYgaGVpZ2h0PTE3IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNkMvNjQvckJBQ0UxT0dCSFRpXzYtVUFBQUJKbTlvUnBjMDc4LnBuZyI+6L2m5Zyo5Yqg6YCf6L+H56iL5Lit5LiOPGltZyB3aWR0aD0xNiBoZWlnaHQ9MTcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zMC83Mi9yQkFDRkZPR0JIVHdwNnBoQUFBQk0wVUZwV1k4OTMucG5nIj7ovabnm7jpgYfvvIzorr7ov5Dliqjml7bpl7TkuLo8aW1nIHdpZHRoPTEwIGhlaWdodD0xNiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzZDLzY0L3JCQUNFMU9HQkhyQXdlVHhBQUFCQVZVSWdDQTMzOS5wbmciPu+8jOWImTxpbWcgd2lkdGg9NjQgaGVpZ2h0PTM4IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNkMvNjQvckJBQ0UxT0dCSHJSbmtvLUFBQUNuaUkyMHNrODQ2LnBuZyI+77yM6Kej5b6XPGltZyB3aWR0aD0xNDkgaGVpZ2h0PTM4IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMzAvNzIvckJBQ0ZGT0dCSHFBOHZoM0FBQUVORUdiSkVvMDM1LnBuZyI+
- 提示2：
- PGltZyB3aWR0aD0xNiBoZWlnaHQ9MTcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC82Qy82NC9yQkFDRTFPR0JIVGlfNi1VQUFBQkptOW9ScGMwNzgucG5nIj7ovabliqDpgJ88aW1nIHdpZHRoPTI1IGhlaWdodD0xOCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzMwLzcyL3JCQUNGRk9HQkhyUXp2Y2RBQUFCaVNkU2Z5UTI2OS5wbmciPuWGheW5tuacqui/veS4ijxpbWcgd2lkdGg9MTYgaGVpZ2h0PTE3IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzAvNzIvckJBQ0ZGT0dCSFR3cDZwaEFBQUJNMFVGcFdZODkzLnBuZyI+6L2m
- 提示3：
- IOWboOWKoOmAnzxpbWcgd2lkdGg9MjUgaGVpZ2h0PTE4IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzAvNzIvckJBQ0ZGT0dCSHJRenZjZEFBQUJpU2RTZnlRMjY5LnBuZyI+5ZCO77yMPGltZyB3aWR0aD0xNDAgaGVpZ2h0PTIyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMzAvNzIvckJBQ0ZGT0dCSHJURks5MkFBQURQU212TFdjMTQ5LnBuZyI+77yM5pWF5YyA6YCf6L+Q5Yqo6L+H56iL5Lit5Y+v6L+95LiKPGltZyB3aWR0aD0xNiBoZWlnaHQ9MTcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zMC83Mi9yQkFDRkZPR0JIVHdwNnBoQUFBQk0wVUZwV1k4OTMucG5nIj7ovaY=
正确答案：Qw==
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
2/4单选题
难度：
2.
如图所示，
两物体在同一直线上运动，当它们相距
时，
在水平拉力和摩擦力的作用下，正以
的速度向右做匀速运动，而物体
此时速度为
，方向向右，它在摩擦力作用下做匀减速运动，加速度大小为
，则追上用的时间为（ ）
如图所示，两物体在同一直线上运动，当它们相距时，在水平拉力和摩擦力的作用下，正以的速度向右做匀速运动，而物体此时速度为，方向向右，它在摩擦力作用下做匀减速运动，加速度大小为，则追上用的时间为（ ） | A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- IOWboOS4ujxpbWcgd2lkdGg9NjUgaGVpZ2h0PTIyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzAvNUEvckJBQ0ZGT0Y5cV96TG8xX0FBQUNHanAxSWtnMjA1LnBuZyI+77yM5omA5LulPGltZyB3aWR0aD0xNiBoZWlnaHQ9MTcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zMC81QS9yQkFDRkZPRjlxX0RhUTN1QUFBQk14S2lTWUk3MzcucG5nIj7niankvZPlgZzmraLov5DliqjmiYDpnIDml7bpl7Q8aW1nIHdpZHRoPTEyMCBoZWlnaHQ9Mzggc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC82Qy80Qy9yQkFDRTFPRjlxLXkwcUN4QUFBRFNHU1VJcUk4MTgucG5nIj4=
- 提示2：
- PGltZyB3aWR0aD0xNiBoZWlnaHQ9MTcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zMC81QS9yQkFDRkZPRjlxX0RhUTN1QUFBQk14S2lTWUk3MzcucG5nIj7nmoTkvY3np7s8aW1nIHdpZHRoPTI1NyBoZWlnaHQ9Mzggc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8zMC81QS9yQkFDRkZPRjlxX1M3THVWQUFBRkFRdXVWeFE5NjYucG5nIj4=
- 提示3：
- PGltZyB3aWR0aD0xNiBoZWlnaHQ9MTcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC82Qy80Qy9yQkFDRTFPRjlxLVRZUnhsQUFBQkpodzJ0dlk0ODcucG5nIj7niankvZPov5jpnIDopoE8aW1nIHdpZHRoPTE4IGhlaWdodD0xOCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzMwLzVBL3JCQUNGRk9GOXFfenp2SFNBQUFCVHlBLXRuczY3NC5wbmciPuaJjeiDvei1tuS4ijxpbWcgd2lkdGg9MTYgaGVpZ2h0PTE3IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzAvNUEvckJBQ0ZGT0Y5cV9EYVEzdUFBQUJNeEtpU1lJNzM3LnBuZyI+
正确答案：Qw==
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
3/4单选题
难度：
3.、两辆汽车在笔直的公路上同向行驶. 当车在车前
处时，车速度为
，且正以
的加速度做匀加速运动；经过一段时间后，车加速度突然变为零. 车一直以
的速度做匀速运动. 经过
后两车相遇. 车加速行驶的时间是
、两辆汽车在笔直的公路上同向行驶. 当车在车前处时，车速度为，且正以的加速度做匀加速运动；经过一段时间后，车加速度突然变为零. 车一直以的速度做匀速运动. 经过后两车相遇. 车加速行驶的时间是 | A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- 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
- 提示2：
- 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
- 提示3：
- 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
正确答案：Qw==
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
4/4单选题
难度：
4.
年在苏联的一条直铁轨上，有一列火车因蒸汽不足而停驶，驾驶员把货车厢甲（如图所示）留在现场，只拖着几节车厢向前方不远的车站开进，但他忘了将货车厢刹好，使车厢在斜坡上
的速度匀速后退，此时另一列火车乙正以
的速度向该货车厢驶来，驾驶技术相当好的驾驶员波尔西列夫立即刹车，紧接着加速倒退，结果恰好接住了货车厢甲，从而避免了相碰. 设列车乙刹车过程和加速倒退过程均为匀变速直线运动，且加速度大小均为
，当波尔西列夫发现货车厢甲向自己驶来而立即开始刹车时，两车相距是
年在苏联的一条直铁轨上，有一列火车因蒸汽不足而停驶，驾驶员把货车厢甲（如图所示）留在现场，只拖着几节车厢向前方不远的车站开进，但他忘了将货车厢刹好，使车厢在斜坡上的速度匀速后退，此时另一列火车乙正以的速度向该货车厢驶来，驾驶技术相当好的驾驶员波尔西列夫立即刹车，紧接着加速倒退，结果恰好接住了货车厢甲，从而避免了相碰. 设列车乙刹车过程和加速倒退过程均为匀变速直线运动，且加速度大小均为，当波尔西列夫发现货车厢甲向自己驶来而立即开始刹车时，两车相距是 | A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- IOS5mei9puWHj+mAn+iHs+mAn+W6puS4uumbtueahOi/h+eoi+WOhuaXtjxpbWcgd2lkdGg9MTAxIGhlaWdodD0zOCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzMwLzcwL3JCQUNGRk9HQW56elh2Tk9BQUFEVkZUamZuYzc2OC5wbmciPjxicj4NCuS5mei9puWcqOatpOaXtumXtOWGheS9jeenu+S4ujxpbWcgd2lkdGg9MTQ0IGhlaWdodD00MSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzZDLzYyL3JCQUNFMU9HQW56aVZMVU9BQUFFSEh5UHBUazg0Mi5wbmciPg==
- 提示2：
- IOS5mei9puWPjeWQkeWKoOmAn+WQjumAgOiHs+aBsOWlveaOpeS9j+eUsui9pu+8iOatpOaXtuS4pOi9pumAn+W6puebuOetie+8ieeahOi/h+eoi+WOhuaXtjxpbWcgd2lkdGg9MTAwIGhlaWdodD00MCBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzMwLzcwL3JCQUNGRk9HQW56amY4SmJBQUFERTBQMjVwUTQyOC5wbmciPjxicj4NCuS5mei9puWcqOatpOaXtumXtOWGheeahOS9jeenuzxpbWcgd2lkdGg9MTI1IGhlaWdodD00MSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzMwLzcwL3JCQUNGRk9HQW56ajZXVzdBQUFEaUYwd3FJbzI4NS5wbmciPg==
- 提示3：
- 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
正确答案：QQ==
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