1. You need to have 6,000 Joules of kinetic energy to knock down a building with a wrecking ball. Use the
graphs to determine the combinations of mass and speed that will give you 6,000 joules of energy.

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

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.