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对较复杂的运动学问题,人们首先考虑用v-t图线求解,笔者发现,用s-t图像对此类问题也能快速求解,下面利用3个例题来具体解析。例1如图1所示,测速仪O和汽车P位于同一直线上,两者相距335 m,测速仪安装有超声波发射和接收装置。某时刻测速仪O发出超声波,同时汽车P由静止开始向右做匀加速直线运动。当测速仪O接收到反射回来的超声波信号时,测速仪O和汽车P相距355 m,已知声速为
For more complex kinematics problems, people first consider using v-t plot solution, I found that using s-t images can also be quickly solved for such problems, the following three examples to use specific analysis. Example 1 As shown in Figure 1, the speedometer O is located on the same line as the car P. The distance between them is 335 m. The speedometer is equipped with an ultrasonic transmitter and receiver. At some point, the speedometer O emits ultrasonic waves, and at the same time, the car P starts from the still and starts to make the uniform acceleration linear motion to the right. When the speedometer O receives the reflected ultrasonic signal, the speedometer O is 355 m away from the car P. The known speed of sound is