A rifle bullet loses half of its velocity in penetrating 24 cm in a wooden plank. The further distance covered by the bullet in coming to rest is:

Options

A. 8 cm
B. 12 cm
C. 24 cm
D. None of these

Answer

a

Explanation

We know that change in K.E.= Work done.
`(x_(1))/(x_(2))=([v^2-(v^2)/4])/([v^2/4-0])=3/4v^2xx4/v^2=3/1`
`(x_(1))/(x_(2))=3/1implies (24)/(x_(2))=3/1implies x_(2)=8` cm.