UTEC students measured the speed of one of the elevators on campus when it descended containing a mass of 450 kg and drew the following graph. a) Indicate what can be stated about the net work delivered to the elevator in different time intervals. Tip, choose intervals 0-4s, 4-12s and 12-14s. b) What is the net power delivered between 0-15 s? c) For a person inside the elevator, in which only the weight and the force of contact with the floor act, Indicate in each previous section which of the forces on it does more or less work.

Alumnos de UTEC midieron la rapidez de uno de los elevadores del campus cuando este descendia conteniendo una masa de 450 kg y obtuvieron la siguiente grafica. a) Indicar que se puede afirmar sobre trabajo neto entregado al elevador en diferentes intervalos de tiempo. Sugerencia, escoger los intervalos 0-4s, 4-12s y 12-14s. W Neto > 0, W Neto = 0, W Neto