Lisa runs up 4 flights of stairs in 22. seconds. She weighs 510. Newtons. If each flight rises 310. cm:
(a) What is her change in potential?
(b) What average power (watts) was required during the 22. s?
(c) What minimum horsepower motor would be required to do this?
(a) 6.32 kJ
(b) 287. watts
(c) 0.385 hp
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