Final answer:
The total energy of the ball as it hits the ground is still 50J, given that energy is conserved in a closed system without external forces and ignoring air resistance.
Step-by-step explanation:
If you drop a ball from a 25-meter building and the total energy of the ball is 50J, what is the total energy of the ball as it hits the ground? Assuming there is no air resistance, the total energy of the ball as it hits the ground is still 50J. This is because in a closed system without external forces, energy is conserved. The potential energy the ball has due to its height above the ground will convert entirely into kinetic energy as it falls, but the total amount of energy remains constant throughout the fall.