A ball is released from a height of 10 m. If after the impact there is loss of 40% in its energy, the ball shall rise upto-

6 m

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0.6 m

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10 m

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0.06 m

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Solution

The correct option is B 6 m
There is $40$ % loss in energy. This implies that 60% of energy is used to go up
$m g h_{f} = \frac{60}{100} m g h_{i}$
$∴ h_{f} = \frac{60}{100} \times 10 = 6 m$

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