ICSE Class 10 Physics 2016 Solved Paper

A boy weighing $40 {\kg}$ climbs up a stair of 30 steps each $20 {\cm}$ high in 4 minute and a girl weighing $30 {\kg}$ does the same in 3 minutes. Compare:

Question : 4 of 73

Marks: +1, -0

The power developed by them.

Solution:

Comparing power developed by them:

\text" Power developed by boy "/\text" Power developed by girl"

\text" Work done by boy/time taken to climbs up the stairs in seconds "/\text" Work done by girl/time taken to climbs up the stairs in seconds "

\;=\;{\;{2400}/{4 × 60}}/{{1800}/{3 × 60}}=\;{2400}/{4 × 60}

× \;{3 × 60}/{1800}

\;=1: 1

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