A ball is dropped onto a floor from a height of $10 m$ . If $20$ % of its initial energy is lost, then the height of bounce is-

2 m

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4 m

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8 m

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6.4 m

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Solution

The correct option is C $8 m$
$E_{f} = 80$ % of $E_{i}$

$\Rightarrow m g h^{'} = (0.8) m g h$

or $\Rightarrow h^{'} = 0.8 h = 8 m$

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A ball is dropped onto a floor from a height of 10m. If 20% of its initial energy is lost, then the height of bounce is-

The correct option is C 8mEf=80 % of Ei⇒mgh′=(0.8)mghor ⇒h′=0.8h=8 m

A ball is dropped onto a floor from a height of $10 m$ . If $20$ % of its initial energy is lost, then the height of bounce is-

The correct option is C $8 m$
$E_{f} = 80$ % of $E_{i}$

$\Rightarrow m g h^{'} = (0.8) m g h$

or $\Rightarrow h^{'} = 0.8 h = 8 m$