The massless spring of a spring gun has a force constant k = 13.5 N/cm. When the gun is aimed vertically, a 10-g projectile is shot to a height of 5.0 m above the end of the expanded spring. How much was the spring compressed initially?

need to see circuit to get time constant

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.