An escalator joins one floor with another one 15 ft ahove. The escalator is Aln t1:11-w, and moves along its length at 2.0 ft/se:

(a) What power must its motor deliver is required to carry a maximum of 100 persons per minute, 0 average mass rres slugs?

(b) A W=160-lb man walks up the escalator in 10 sec. How much work doc-s the motor do on him?

(c) It this man turned around at the middle and walked down the escalator so as to stay at the same level in space, would the, motor do work on him? If so, what power does it deliver for this purpose?

(d) is there any (other?) way the man could walk along the escalator without consuming power front the motor?