If I dropped a standard marble and a house brick out of a second storey window at the exact same time...?

the house brick. compare a piece of paper faling down and the dandruff from your hair falling down. although a paper obviously is heavier, a dandruff would fall faster. WHY? bcuz they have different surface area. the paper has a much greater surface area and would receive much more air resistance.

get it?

The one with less air resistance in proportion to its mass. that's why feathers fall so slow, they have a big surface in proportion to the mass. In vacuum all things fall equally. I would think the marble would fall slightly faster, because an orb has less air resistance than a cube, but i don't think you can actually see the difference on that height.

p.s.: the energy of a falling brick is higher, shure, but it has more mass to accelerate, so it will fall at the same speed (in vacuum)

F=ma

that is force = mass x acceleration.

mass is higher for the brick, therefore multiplying by accel due to gravity (9.8m/s^2), the force of the brick is larger, therefore the brick travels faster.

the one with the greatest mass (weight in kg) so the brick.

According to Newton's second law, see http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/n...