Question

A hollow plastic ball is taken to the bottom of a through of water and released there (see adjoining figure).

(a) What happens to the ball? 

(b) Give a reason for this phenomenon.

Answer 1

(a) The ball will come on the surface of the water and will float there. 

(b) The density of the ball is less than the density of water. The another reason could be the gravitational pull on the ball is less than the upthrust exerted by water.