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A man whose mass is 80kg climbs a staircase in 20s and expends power of...

Physics
JAMB 1998
A man whose mass is 80kg climbs a staircase in 20s and expends power of 120W. Find the height of the staircase.[g = 10ms-2]
  • A. 1.8m
  • B. 2.0m
  • C. 2.5m
  • D. 3.0m
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Correct Answer: Option D
Explanation
Power x time = mgh

120 x 20 = 80 x 10 x h

2400 = 800h

making h the subject of formula,divide both side by 800

\(\frac{2400}{800}\) = h

h = 3m
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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