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A bullet slows from V to V/2 in 30 cm of a target: further thickness before it stops

The same question, asked 2 times: 11 May 2023 S1, 11 May 2024 S1. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    11 May 2023 S1

    10
    A bullet is fired on a target with velocity V. Its velocity decreases from v to v/2 when it penetrates 30 cm in a target. Through what thickness will it penetrate further in the target before coming to rest?

    Tap an option to check your answer.

  2. Question 2

    11 May 2024 S1

    31
    A bullet is fired on a target with velocity V. Its velocity decreases from V to V/2 when it penetrates 30 cm in a target. Through what thickness it will penetrate further in the target before coming to rest?

    Tap an option to check your answer.