Acceleration is calculated by taking the change in velocity and dividing by the time. what is the
proper unit for acceleration?

seconds, s

meters per second, m/s

meters, m

meters per second per second, m/s/s

m/s/s

Explanation:

Acceleration is change in velocity over time.

a = Δv / t

a = [m/s] / [s]

a = [m/s/s]

measure their densities same density, same sub

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.