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Bullet loses part of its speed in the first 4 cm of a block: how much further it goes

The same question, asked 2 times: 27 Jul 2022*, 27 Jan 2024. Every wording below, oldest first.

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  1. Question 1

    27 Jul 2022

    95
    The velocity of the bullet becomes one third after it penetrates 4 cm4\text{ }cm in a wooden block. Assuming that bullet is facing a constant resistance during its motion in the block. The bullet stops completely after travelling at (4+x)cm(4 + x)cm inside the block. The value of xx is:

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  2. Question 2

    27 Jan 2024

    110
    A bullet is fired into a fixed target loses one third of its velocity after travelling 4 cm. It penetrates further D×10−3 mD \times10^{- 3}\text{ }m before coming to rest. The value of DD is:

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