Question:
Identical packets are dropped from two aeroplanes. One above the equator and the other above the north pole both at height h. Assuming all conditions are identical will those packets take same time to reach the surface of earth. Justify your answer.
(CBSE Sample Paper)
Solution:
Time taken by an object to fall through height h at a place is given by
$t=\sqrt{\frac{2 h}{g}}$
Since, value of ' $g$ ' at poles is greater than at the equator, therefore, packet dropped above the north pole will take less time than the packet dropped above the equator to reach the surface of the earth.