2. A 50.0 kg shell was fired from a cannon at earth's surface to a maximum height of 400. m.
a. What is the potential energy at maximum height?
b. It then fell to a height of 100. m. What was the loss of PE as
it fell?

a) 196000 Joules

b) 147000 Joules

Explanation:

a. Potential energy is the energy possessed by an object by virtue of its position.

m= mass of object = 50.0 kg

g = acceleration due to gravity =

h = height of an object = 400 m

Putting in the values we get:

Thus the potential energy at maximum height is 196000Joules.

b.    

Thus loss in P.E = (196000Joules-49000Joules) = 147000 Joules

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.