In the annual Empire State Building race, contestants run up 1,575 steps to a height of 1,050 ft. In 2003, Australian Paul Crake completed the race in a record time of 9 min and 33 s. Mr. Crake weighed 143 lb (65 kg).
(a) How much work did Mr. Crake do in reaching the top of the building?
(b) What was his average power output (in ft-lb/s and in hp)?