If two balls of same masses are dropped on sand, the depths of penetration is same if: I. Heavier ball is dropped faster than lighter ball II. Lighter ball is dropped faster than heavier ball III. The product ‘mv’ is same for both bodies IV. None of these
If two balls of the same masses are dropped on sand, the depths of penetration is the same if the product of mass and velocity$(mv)$ is the same for both bodies.
Therefore, option III is correct.
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