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A disk and a sphere of same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first?

1. Disk
2. Sphere
3. Both reach at the same time
4. Depends on their masses

Correct answer: Sphere

Solution

The sphere reaches the bottom first because it has a smaller moment of inertia relative to its mass compared to the disk, leading to faster acceleration down the incline.

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