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Which of the following materials will not sink in water?

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Knife

Coin

Steel rod

Tennis ball

answer is D.

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Detailed Solution

If an object is denser than water it will sink when placed in water, and if it is less dense than water it will float.

Metal objects like coins, steel rods, and knives sink in water because they are heavier than water. Tennis balls float over water because it is lighter than water.

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