An object is released from rest above Earth’s surface from a height H, as shown in the figure. (a) i. Determine whether the system containing only the object is open or closed with regards to the mechanical energy of the system, and state your reasoning.

heat the gas and measure the pressure

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.

momentum of soft ball three times less than baskey ball