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一般的物理计算题常只有一个答案,但是有些计算题,对同一个问题则有两个或两个以上的答案。近年来这些题以标准化题型之一的多解选择题出现,称为计算型多解选择题。计算型多解选择题通常可分为三种类型。第一类:一题多过程解的选择题。这类题的已知条件和所要达到的目的相同,但从不同的物理过程出发,可以解出不同的答案。因此又叫条件一目的型选择题。 [例1]某人在高层楼房的阳台边上以 20米/秒的速度竖直向上抛出一个小球,则小球运动到离抛出点15米处所经历的时间(不计空气阻力)约为: A、1秒。B、2秒。 C、3秒。D、4.6秒。此题的关键是对小球“离抛点15米”的完整分析。从球运动至离抛出点15米处应有三个物理过程,即从时间上讲有三个阶段:
A general physical calculation question often has only one answer, but some calculation questions have two or more answers to the same question. In recent years, these problems have emerged as multiple-choice multiple-choice questions, one of the standardized questions. Computational multiple-choice multiple-choice questions can usually be divided into three types. The first category: multiple-choice solution to a problem. The known conditions for this type of problem are the same as the objectives to be achieved, but starting from different physical processes, different answers can be solved. Therefore, it is called a conditional one-choice type multiple choice question. [Example 1] A person throws a small ball upright at a speed of 20 m/s on the side of a balcony of a high-rise building, and the time it takes for the ball to move to a distance of 15 meters from the throw point (excluding air resistance) is about For: A, 1 second. B, 2 seconds. C, 3 seconds. D, 4.6 seconds. The key to this question is the complete analysis of the ball “15 meters from the throw.” There should be three physical processes from the movement of the ball to the point 15 meters from the point of throwing, ie there are three stages in terms of time: