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There are 3 balls of same shape and size made of wood, iron and plastic. Which one of them would have highest inertia?

1. wood
2. Iron
3. Plastic
4. None of these

Correct answer: Iron

Solution

Inertia is the resistance of an object to changes in its state of motion, and it increases with mass. Since the balls have the same size and shape, the iron ball has the greatest mass, so it has the highest inertia.

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