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一、本题共13小题,每小题2分,共26分。在每小题给出的四个选项中,只有一项是正确的。 1.关于速度和加速度的关系,下列说法正确的是哪个? A.物体加速度方向保持不变,速度方向也一定保持不变。 B.物体速度变化量越大,则加速度一定越大。 C.物体速度变化越快,则加速度一定越大。 D.物体运动的速度随着加速度的减小一定减小。
A total of 13 small questions in this question, each question 2 points, a total of 26 points. Of the four options given in each question, only one is correct. 1. With regard to the relationship between speed and acceleration, which of the following statements is correct? A. The direction of the acceleration of the object remains unchanged, and the direction of the speed must also remain constant. B. The greater the amount of change in the speed of the object, the greater the acceleration must be. C. The faster the object speed changes, the greater the acceleration must be. D. The speed at which the object moves decreases as the acceleration decreases.