A 56 g Frisbee is thrown from a point 1.3 m above the ground with a speed of 15 m/s. When it has reached a height of 2.1 m, its speed is 12 m/s. What was the reduction in the mechanical energy of the Frisbee-Earth system because of air drag

The mechanical energy of frisbee-earth system because of air is equal to

Explanation:

From work energy theorem ;the total work done is equal to change in its kinetic energy

= work done by gravity =  

= work done by air drag

    From above equations

=

15.3 cos 65 degrees trig

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.