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
Correct Answer: D. 3.0m
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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