51. Tres trabajadores levantan un piano de 3.50 kN con rapidez constante hasta un departamento a 25.0 m arriba de la calle utilizando un sistema de polea sujeto al techo del edificio. Cada trabajador puede suminis- trar 165 W de potencia y el sistema de polea es 75% efi- ciente (de manera que 25% de la energía mecánica se pierde debido a la fricción en la polea). Ignorando la masa de la polea, encuentre el tiempo requerido para subir el piano desde la calle al departamento.​

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the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

a. carbon dioxide, i took the test and got it right.