Answer to Question #299638 in Classical Mechanics for Mafydre

Question

A 60g bullect is fired at a target that presents an average resistive force to the passage of the bullet of 20KN per metre thickness of the material from which it is constructed. If the bullet strikes the target at 600m/s, what does the minimum thickness of target have to be to stop the passage of bullet completely.

Answer 1

$\frac{mv^2}2=Fs,$

$s=\frac{mv^2}{2F}=54~cm.$