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  4. A uniform rod is placed vertically on a smooth surface and then released. Then,

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Q. A uniform rod is placed vertically on a smooth surface and then released. Then,

NTA AbhyasNTA Abhyas 2020System of Particles and Rotational Motion

Solution:

Since no external force is present on the rod in horizontal direction, the velocity of the centre of mass of rod, in horizontal direction, remains constant i.e., zero.
So, centre of mass of rod drops vertically downwards.