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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


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


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