un obrero empuja horizontalmente una caja de 30 kg una distancia de de 4.5m en un plano con velocidad constante. El coeficiente de friccion cinetica entre el piso y la caja es de 0.25. ¿que magnitud de fuerza debe aplicar el obrero?

less than one you can't create energy

multiply 2kg by latent heat of vap

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.

dang that balls went far