试题与答案

于10月1日18时59分57秒“嫦娥二号”探月卫星在西昌卫星发射中心发射升空.发

题型:问答题

题目:

于10月1日18时59分57秒“嫦娥二号”探月卫星在西昌卫星发射中心发射升空.发射“嫦娥二号”的电视直播中报道,火箭(连同上端的飞船)总高度为58m,发射塔高度约为100m.某同学在观看电视时,默默地记下发射前火箭上端的位置A(如图所示),并用自己的手表测出火箭从开始发射到下端通过A点所用的时间约为4s.假设火箭离开发射塔前是做的是匀加速直线运动,请你根据上述已知条件,试求出:

(1)火箭的加速度大小;

(2)火箭末端通过A处时的速度大小.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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