Question

A bullet when fired into a target loses half of its velocity after penetrating 20 cm. Further distance of penetration before it comes to rest is

• A. 6.66 cm
• B. 3.33 cm
• C. 12.5 cm
• D. 10 cm
• E. 5 cm

Hint:

A useful shortcut for this specific problem: If a bullet loses \(1/n\) of its velocity after distance \(s\), it travels a further distance of \(s / (n^2 - 1)\) before stopping. Here, \(n=2\), so distance = \(20 / (2^2 - 1) = 20/3\).

Answer 1

The Correct Option is A