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  4. An inelastic ball is dropped from a height of 100 m. Due to some reasons it loses 20 % of its energy. The height of rebound of ball is

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Q. An inelastic ball is dropped from a height of $100\, m$. Due to some reasons it loses $20\%$ of its energy. The height of rebound of ball is

Work, Energy and Power

Solution:

$mgh' = (mgh) \, \frac{80}{100}$ i.e. $h' = 100 \times \frac{80}{100} $ = 80 m