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 : 3 of 73

Marks: +1, -0

The work done by them.

Solution:

Given :

m_1=40 {\kgf}, m_2=30 {\kgf}, h_1=

h_2, t_1=4

minutes

=4 × 60 {\ sec} ., t_2=3

minutes

=3 × 60 {\ sec}

.
Comparing work done by them :

\;{\;\text " Work done by a boy "\;}/{\;\text " Work done by a girl "\;}\;=\;{m_1 g h_1}/{m_2 g h_2}

\;=\;{m_1}/{m_2}=\;{40}/{30}

\;=4: 3

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