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23 May, 19:53

A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to heating, how high does it rise after the third bounce, provided we released it 2.3 m from the floor?

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  1. 23 May, 20:17
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    H = 109.14 cm

    Explanation:

    given,

    Assume,

    Total energy be equal to 1 unit

    Balance of energy after first collision = 0.78 x 1 unit

    = 0.78 unit

    Balance after second collision = 0.78 ^2 unit

    = 0.6084 unit

    Balance after third collision = 0.78 ^3 unit

    = 0.475 unit

    height achieved by the third collision will be equal to energy remained

    H be the height achieved after 3 collision

    0.475 (m g h) = m g H

    H = 0.475 x h

    H = 0.475 x 2.3 m

    H = 1.0914 m

    H = 109.14 cm
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