有一道试题是这样的: [例1]一辆质量为5.0×10~5千克,在平直轨道上以额定功率3.0×10~3千瓦加速行驶的列车,当速度由10米/秒加速到可能达到的最大速率30米/秒时,共用2分钟。在这段时间内,列车前进的距离是多少?列车受到的阻力多大? 这道题的情景是列车以恒定功率行驶,其运动是加速度变化的变速运动。当它速度达到最大时,F=f, One of the questions is as follows: [Example 1] A train with a mass of 5.0 × 10 to 5 kg and an acceleration of 3.0 × 10 to 3 kW on a flat track with an acceleration of 10 m/s The maximum possible rate of 30 meters/second is shared for 2 minutes. During this time, what is the distance the train is moving and how much resistance the train is subjected to? The scenario for this question is that the train is traveling at a constant power, and its movement is a variable-speed movement of acceleration. When it reaches its maximum speed, F=f,