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A solid sphere, disc and solid cylinder all of the same mass and made of the same material are allowed to roll down (from rest) on the inclined plane, then

1. solid sphere reaches the bottom first
2. solid sphere reaches the bottom last
3. disc will reach the bottom first
4. all reach the bottom at the same time

Correct answer: solid sphere reaches the bottom first

Solution

The solid sphere reaches the bottom first because it has the smallest moment of inertia relative to its mass, resulting in the highest acceleration during rolling motion.

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