Alex normally walks up the stairs to his office in a time of 20 s. On Fridays, he 1 po.r-;t takes the steps two-at-a time and ascends the stairs in 10 s. Which statement is true about Aleks Friday stair-climbing? O Alex does half as much work as usual O Alex develops twice as much power as usual O Alex develops half as much power as usual O Alex does twice as much work as usual