A child is sitting on a swing. Its minimum and maximum heights from the ground are $0.75 m$ and $2 m$ respectively, its maximum speed will be :

5 m / s

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8 m / s

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10 m / s

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15 m / s

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Solution

The correct option is B $5 m / s$
Maximum speed $v = \sqrt{2 g (h_{2} - h_{1})}$
$= \sqrt{2 \times 10 \times (2 - 0.75)}$
$= \sqrt{(20 \times 1.25)}$
$= \sqrt{25} = 5 m / s$

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A child is sitting on a swing. Its minimum and maximum heights from the ground are 0.75m and 2m respectively, its maximum speed will be :

The correct option is B 5m/sMaximum speed v=√2g(h2−h1) =√2×10×(2−0.75) =√(20×1.25) =√25=5m/s

A child is sitting on a swing. Its minimum and maximum heights from the ground are $0.75 m$ and $2 m$ respectively, its maximum speed will be :

The correct option is B $5 m / s$
Maximum speed $v = \sqrt{2 g (h_{2} - h_{1})}$
$= \sqrt{2 \times 10 \times (2 - 0.75)}$
$= \sqrt{(20 \times 1.25)}$
$= \sqrt{25} = 5 m / s$