Question

24. It is easier to lift a heavy stone under water than in air.
Explain​

Answer 1

Answer:

When a stone is under water then its weight is less than its weight in air as it is under the action of buoyant force that is present inside the water and is reacting on the stone in opposite direction to the gravity. Hence it is easier to lift a heavy stone under water than in air.

Answer 2

It is easier to lift a heavy stone under water than in air because in water, it experiences an upward buoyant force which balances the actual weight of the stone acting downwards. Thus, due to upthrust there is an apparent loss in the weight of the heavy stone, which makes it lighter in water, and hence easy to lift.

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