Identify whether the following statements describe a change in acceleration.
a. a car stopped at a stop sign
b. a boat traveling east at 10 miles per hour
c. an airplane traveling north 600 miles per hour
d. a person running at 5 meters/second along a curving path

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.

grav potential energy

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.