Question

A wooden block is floating in water in a beaker. During the free fall of the beaker, the upthrust on the block will be ___.

• A. equal to the weight of the block
• B. more than the weight of the block
• C. less than the weight of the block
• D. zero

Answer 1

The correct option is D zero

A freely falling body experiences zero apparent weight. Hence, upthrust on it will also be zero. Here, when the system falls freely, the wooden block floating in the water is also in freefall and therefore, feels zero upthrust.