This is a bit of a trick question! In a vacuum, both the 5 rupee coin and the 2 rupee coin would reach the earth at the same time. This is because gravity affects all objects equally, regardless of their mass.

However, in reality, air resistance will play a role. The 5 rupee coin is likely heavier and denser than the 2 rupee coin, meaning it will experience less air resistance. Therefore, the 5 rupee coin will reach the earth slightly quicker.

Important Note: It's dangerous to drop objects from tall buildings. It's best to avoid this kind of experiment in the real world.