Un ascensor de masa 495 kg sube a lo largo de 4 pisos (cada piso tiene una altura de 1,2 m) con una aceleración de 0,73 m/s2. Sabiendo que la fuerza de roce en el ascensor al subir es 1350 N. Calcular el trabajo total y la potencia realizada sobre el ascensor para subir los cuatro pisos, si tarda 24 s.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?