【Daily Question】Theoretical Foundation 2020.02.12

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Multiple-choice question: When a rigid body undergoes translation, the velocities and accelerations of all points within it at a given instant are ( ). A. The velocities of different points within the body are different, but the acceleration is the same. B. The velocities of all points within the body are the same, but the accelerations are different. C. The velocities of all points within the body are the same, and so are the accelerations. D. The velocities of different points within the body are different, and the accelerations are also different. Answer: C. When a rigid body moves in translation, at any given instant the velocities and accelerations of all points within it are the same; it can be considered as the motion of a single point. Tip: An additional reward will be given to those who can explain the problem-solving process; the answers can be seen here!