A stone of mass 100 gm is thrown with a velocity of 9.8 \( \text{ms}^{-1} \) from the bottom of a 2 storied building and it barely reached the roof of that building. If it is allowed to fall freely from there, what will be the energy of the stone while crossing the window of the first floor?

A 2.4 J

B 4.8 J

C 240 J