题目内容
计算题2（习题9-4）中，（1）加速度分析：火箭受到重力和推力作用，由ΣF=ma，加速度a方程为1；（2）速度分析：通过积分计算速度v，0-2s段：初值条件t=0，v=2，即速度的积分下限，时间的积分上限为3，积分结果为4；2-10s段：初值条件为t=2s，v=5，即速度的积分下限，时间积分上限为6，积分结果为7；（3）运动方程分析：通过速度的一阶积分计算。
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