以50千米/小时速度匀速行驶的出租车驶向25千米远的机场,不考虑汽

50千米/小时速度匀速行驶的出租车驶向25千米远的机场,不考虑汽车中途停驶,则需要      小时才能到达机场。出租车从高架匀速驶向地面时,出租车的机械能        。(选填:“变大”、“变小”或“不变”)若以      为参照物,出租车是静止的。

答案

0.5;变小;乘客(司机)

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