Bullet

A bullet is moving with a velocity of $30\sqrt{2}\ \si{\meter/\second}$ is fired into a fixed target, it penetrates to a depth of $s$ meters. If the bullet is fired into a target of thickness $\dfrac{s}{2}$ meters, made from the same material, with the same velocity, what will be the bullet's velocity when it exits the target?

Assumptions

• The resistive force on the bullet in the target is a constant, independent of velocity or position.