The energy possessed by the bullet when strike with wooden plank

Suppose a marble is hit on a wooden plank, a bullet is hit the wooden plank. Can you imagine what happened as difference between these?, of course, you think that bullet has more energy than marble, so it makes a hole in the wooden plank, but the marble can't
Let a bullet of mass m moving with velocity v strike the wooden plank and penetrate through a distance x before coming to rest.
initial velocity of the bullet(u)=V
final velocity of the bullet(v)=0
After penetration, the distance travelled by the bullet in to the wooden plank (s)=x
then according to kinematic equation v^2-u^2=2as
therefore