A bullet of mass \( 20 \mathrm{~g} \) has an initial speed of \( 1 \mathrm{~ms}^{-1} \), just be...

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A bullet of mass \( 20 \mathrm{~g} \) has an initial speed of \( 1 \mathrm{~ms}^{-1} \), just before it starts penetrating a mud wall of thickness \( 20 \mathrm{~cm} \). If the wall offers a mean resistance of \( 2.5 \times 10^{-2} \mathrm{~N} \), the speed of the bullet after emerging from the other side of the wall is close to
(a) \( 0.4 \mathrm{~ms}^{-1} \)
(b) \( 0.1 \mathrm{~ms}^{-1} \)
(c) \( 0.3 \mathrm{~ms}^{-1} \)
(d) \( 0.7 \mathrm{~ms}^{-1} \)
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