When a bullet is fired at a target, its velocity decreases by half after penetrating \( 30 \math...

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When a bullet is fired at a target, its velocity decreases by half after penetrating \( 30 \mathrm{~cm} \) into it. The additional thickness it will penetrate before coming to rest is [Kerala PMT 2007]
(a) \( 30 \mathrm{~cm} \)
(b) \( 40 \mathrm{~cm} \)
(c) \( 10 \mathrm{~cm} \)
(d) \( 50 \mathrm{~cm} \)
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