Under which condition is no work done? a force pushes an object and slows it down. a force pulls an object and speeds it up. a force pulls down on an object that moves downward. a force pushes up on an object that stays in place.

option (d) is correct. No work is done when a force pushes up on an object that stays in place.

work done= W= F d cosθ

F= force

d= displacement

θ= angle between the displacement and force

if the object stays at its place, d=0

so w= F (0) cosθ

W=0

so work done is zero when the object doesn't move.

d

Explanation:

the assestment will probley apele with cause and effect

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.