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Q.

A solid iron ball and a solid aluminium ball of the same diameter are released together on a deep lake. Which ball will reach the bottom first?

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a

Both balls will reach the bottom at the same time

b

Iron ball

c

The aluminium ball will never reach the bottom and will remain suspended in the lake

d

Aluminium ball

answer is B.

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Detailed Solution

Since both balls have the same volume; they experience the same upthrust. Since the density of iron is greater than that of aluminium, the iron ball has a greater mass and therefore a greater weight; it therefore accelerates more and will reach the bottom before the aluminium ball. Hence the correct choice is (b). 

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