Question

We have two identical balls in terms of diameter and weight. However, one of them is solid and the
other is hallow. Without knocking the ball, can you find the solid ball ?

Answer 1

Answer:

put both the balls in water the ball which will float is the hallow and the one that sinks is the solid one

Answer 2

Answer:

Just release the two balls from the top of inclined plane, then the solid ball reaches first. Because the

solid ball has a smaller moment of inartia and hence less mechanical energy is spent on rotating the ball

and therefore it will reach earlier.