A man whose mass is 80kg climbs a staircase in 20s and expends power of 120W. Fi...
Question
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]Options
A) 1.8m
B) 2.0m
C) 2.5m
D) 3.0m
Related Lesson: What is Power? | Work, Energy and Energy Resources
The correct answer is 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
More Past Questions:
Dicussion (1)
Other Subjects
- English Language
- Biology
- Government
- Mathematics
- Chemistry
- Economics
- Christian Religious Knowledge
- Commerce
- Geography
- Literature In English
- Accounts
- Agricultural Science
- General Paper
- Islamic Religious Knowledge
- History
- Further Mathematics
- Current Affairs
- Civic Education
- Computer Studies
- Yoruba
- Hausa
- Igbo
- French
- Home Economics
- Sweet Sixteen
- Fine Arts
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