Atrain car of mass 3,825 kg sits at rest on the track. a second car of mass 5,169 kg moving at 6 m/s slams into it and they stick together. what is the combined speed of the train cars after the collision?

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.

the answer should be in the picture.