First slide

Power

Question

A man of mass 60kg lifts a 15kg mass to the top of a building of height 10m in 5 minutes. His efficiency is

Moderate

A

10%
B

20%
C

30%
D

40%

Solution

$\fn_cm \large \eta = \frac{{{W_{output}}}}{{{W_{input}}}} \times 100$
$\large \eta = \frac{{15}}{{75}} \times 100 = 20\%$

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