Why will a sheet of paper fall slower than one that is crumbled into a ball

Will you chech and finish these for me, because i am stumped with them.

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

Gunpowder residue is most likely to show up where on a shooters hands