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ICSE Class 10 Answered

conpare the worl done
Asked by nilesh.dhote74 | 27 Apr, 2020, 06:18: PM
Expert Answer
(i) The work done by persons A and B is independent of time. Hence both A and B will do the same amount of work.
Hence, 
 
fraction numerator W o r k space d o n e space b y space A over denominator W o r k space d o n e space b y space B space end fraction space equals space 1 colon 1  

(ii)Power developed by the person A and B is calculated as follows:

A takes 20 s to climb the stairs while B takes 15 s, to do the same. Hence B does work at a much faster rate than A; more power is spent by B.

P o w e r space proportional to space fraction numerator 1 over denominator t i m e end fraction space
A s space t h e space w o r k space d o n e space i s space s a m e

fraction numerator P o w e r space d e v e l o p e d space b y space A space over denominator P o w e r space d e v e l o p e d space b y space B space end fraction space equals space 15 over 20 space equals 3 colon 4


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