Why does two objects with the same weight one is larger and flatter drop from a tall building why object hit ground last?

Two objects with the same weight but different shapes (one larger and flatter) dropped from a tall building will not necessarily hit the ground at different times if air resistance is negligible. In a vacuum, both objects will experience the same acceleration due to gravity and hit the ground at the same time, regardless of their size and shape. However, if air resistance is present, the larger and flatter object will experience greater air resistance and reach a lower terminal velocity compared to the smaller and more streamlined object. As a result, the smaller object will reach the ground first.

The effect of air resistance can be significant for objects with large surface areas and low masses, such as a sheet of paper or a feather. These objects experience a greater drag force due to their larger surface areas, which slows their descent. On the other hand, more compact and streamlined objects, such as a ball or a rock, experience less air resistance and fall faster.

Therefore, in the presence of air resistance, the time taken for objects to reach the ground depends on both their weight and their shape, with heavier and more streamlined objects reaching the ground first.