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Work, Energy and Power — Physics STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11PhysicsWork, Energy and Power2 Marks
Question
A bob is pulled sideway so that string becomes parallel to horizontal and released. Length of the pendulum is $2\ m.$ If due to air resistance loss of energy is $10\%,$ what is the speed with which the bob arrived at the lowest point.
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Answer

$\frac{1}{2} m v^2=90 \% \text { of mgh }$
$\therefore v=6 m / s $

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