A change that would most improve his results would be; D) Connecting the galvanometer to the coil
Im guessing it's (a) since the numbers go in chronological order and you read the periodic table left to right
D=at²
441m=(5*9.81m/s²)(t²)
t²=441/(5*9.81)
t≈√8.99
t≈3 sec
A dwarf planet is a small celestial body resembling a planet, but lacks necessary things to be a planet