Four balls are dropped from a platform. Just before they are dropped, they all have no kinetic energy.. Which of the balls will have the most kinetic energy at the end of the drop? A. The 0.2 kg tennis ball

B. The 0.5 kg baseball

C. The 0.75 kg basketball

D. the 2 kg bowling ball

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Answer:

5.6⋅10−^19  j

do you need the explaination?

Seems cool i guess ttyl