Special topic: sports and strength.

Analysis: All objects have the property of keeping still or moving in a straight line at a constant speed.

Solution: Solution: Inertia is a characteristic of an object, which refers to the property that an object remains in a static state or a state of uniform linear motion.

The car moves at a uniform speed on a smooth track, and the rigid ball pops up vertically relative to the car. Because of the inertia of the ball, it still has to maintain its original state of motion, that is, the state of uniform linear motion, so the position where the ball falls is at point P of the orbit.

So choose D.

Comments: This question mainly examines students' understanding and mastery of inertia. Inertia is very common in daily life, so we should pay attention to careful observation and understanding in our study, and use the inertia knowledge we have learned to solve related physical problems.

Answer over

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